I've been getting a few requests recently asking about the yarn I used to make the 12 patterns in my Star Wars book, so here are all the details. I live in the UK, so that's where I get all my yarn from. I use double knitting (DK) weight yarn, equivalent to 3:light weight in the US, and 8 ply in Australia/NZ - there's a yarn thickness guide on Ravelry which is very helpful. (By the way, the yarn I used is not the same as the yarn in the kit. That isn't a particular brand, and was sourced by the publisher separately.)
If you can't get hold of the yarns listed below, you can at least look at them in an online store such as Wool Warehouse or LoveCrochet, which might help you find equivalents closer to home.
I used mostly Hayfield Bonus DK, including Black (965) and White (961) for many of the characters. Here's the list of the yarn used for each character individually, not including black and white yarn:
Boba
Fett: Hayfield Bonus DK, Orchard (904), Rustic Red (891), Dark
Grey Mix (790), Light Grey Mix (814), Pumpkin (766), Robin DK Rust (26) (now unavailable, try Stylecraft Special DK Copper (1029) instead)
C-3PO:
Hayfield Bonus DK, wheat (816), Robin Paintbox DK, Leopardskin
(197) (possible alternative for gold, Hayfield Bonus DK, Pumpkin
(766))
Chewbacca:
Hayfield DK with wool, brogue (92) for the darker colour,
and Hayfield Bonus DK , walnut (927) for the lighter colour. Alternative lighter colour, Robin DK Honey (0129). Bandolier, Hayfield
Bonus DK Copper (843) (now unavailable, try Fox (779), or Stylecraft Special DK Copper (1029) instead) and Light Grey Mix (814)
Darth
Vader: Hayfield Bonus DK, Light Grey Mix (814), Emerald (916),
Signal Red (977) or Classic Red (833), Dark Grey Mix (790)
Wicket
the Ewok: Hayfield DK with wool, brogue (92) and Hayfield
Bonus DK Copper (843) (now unavailable, try Fox (779), or Stylecraft Special DK Copper (1029) instead) and Oatmeal (964)
Han
Solo: Hayfield Bonus DK, Chocolate Brown (947), Biscuit (963), Pine (761), Cream
(812), Rustic Red (891) or Classic Red (833)
Jabba
the Hutt: Hayfield Bonus DK, orchard (904) and wheat (816)
Luke
Skywalker (Jedi): Hayfield Bonus DK, Wheat (816), Biscuit (963), Dark
Grey Mix (790), Lightsaber, Bright Green (886) or Robin DK Cordial (162), Light
Grey Mix (814)
Princess
Leia: Robin DK Brown (051), Hayfield Bonus DK Biscuit (963), Light Grey Mix (814)
and Rustic Red (891) or Classic Red (833)
R2-D2:
Hayfield Bonus DK, Royal (979), Light Grey Mix (814) or Robin DK
Silver (027)
Yoda:
(note, the green I used is not available anymore, these are possible
alternatives) Robin DK, Lovat (144), Paintbox Yarns simply DK, Slate Green or Hayfield Bonus DK, Grass (825), Hayfield Bonus DK, Chocolate Brown (947), Oatmeal
(964) or Hayfield DK with wool, Sand (091)
I know that seems like an awful lot of different yarns, but a lot of them are repeated for different characters, and I used slightly different tones of yarn where you could use the same one if you want to economise, so here are the main colours of yarn you need:
Pale Green for Yoda: Robin DK, Lovat (144)
Green for Jabba and Boba Fett: Hayfield Bonus DK, orchard (904)
Pale skin colour for Leia, Han and Luke: Hayfield Bonus DK, Biscuit (963)
Flaxen gold/blond colour for C-3PO, Jabba's face and Luke's hair: Hayfield Bonus DK, Wheat (816)
Light Brown for Chewbacca: Hayfield Bonus DK, walnut (927)
Brown for Chewbacca and Wicket: Hayfield DK with wool, brogue (92)
Brown for Han's hair and Yoda's body: Hayfield Bonus DK, Chocolate Brown (947)
Dark Brown for Leia's hair: Robin DK Brown (051)
(You could just use the same shade of brown for Han and Leia's hair)
Two shades of grey used for many of the characters, you could just use one of them: Dark Grey Mix (790), Light Grey Mix (814)
Light Beige for Yoda's robe and Wicket's feet: Oatmeal (964) or Hayfield DK with wool, Sand (091)
Rust Brown for Wicket's hood and Chewy's bandolier: Hayfield Bonus DK Copper (843) - similar to Robin DK Rust (26) used for Boba Fett so could use either. (These both seem to be unavailable now, so try Fox (779), or Stylecraft Special DK Copper (1029) instead).
Royal Blue for R2-D2: Hayfield Bonus DK, Royal (979)
Dark Blue for Han's trousers: Hayfield Bonus DK, Pine (761)
Cream for Han's shirt, could substitute white: Hayfield Bonus DK, Cream (812)
Red for Boba Fett's helmet, can be used for side of Han's trousers and Leia's lips: Hayfield Bonus DK, Rustic Red (891)
Then there are a few yarns that you only need a very small amount of, such as the variegated brown yarn for C-3PO's middle (Robin Paintbox DK, Leopardskin (197)), the dark yellow on Boba Fett's costume (Hayfield Bonus DK, Pumpkin (766)), the bright red and greens used for the buttons on Darth Vader and his and Luke's lightsabers.
I hope that list is some help, just ask if you have any questions.
****New information, March 2017****
Now that Star Wars Even More Crochet is out, here are all the yarns I used for the second set of characters (again, not including black and white):
Obi-Wan Kenobi: Hayfield Bonus DK,
Silver Grey (838), Biscuit (963), Chocolate Brown (947), Oatmeal (964) or Alpine (942) or Robin DK Oatmeal (035).
Admiral Ackbar: Hayfield Bonus DK, Copper (843) (now unavailable, try Fox (779) instead), Aran (993), Sunflower
(978), Silver Grey (838).
Jawa: Hayfield Bonus DK, Chocolate
Brown (947) for cloak and Hayfield
DK with wool (shade 92, brogue) for feet.
Poe Dameron: Hayfield Bonus DK, Chocolate
Brown (947), Oatmeal (964), Dark Grey Mix
(790), Light Grey Mix (814), Classic Red (833), Robin DK Cinnamon
(131).
BB-8: Hayfield Bonus DK, Silver Grey
(838), Bright Orange (981).
Cantina Band: Hayfield Bonus DK, Biscuit (963), Dark Grey Mix (790), Silver Grey (838), Walnut (927).
Lando: Hayfield
Bonus DK, Walnut (927), Bluebell (969), Pumpkin (766).
Rey: Hayfield Bonus DK, Chocolate
Brown (947), Biscuit (963), Oatmeal
(964), Walnut
(927), Hayfield DK with wool, brogue (92), Silver
Grey (838), Turquoise (998).
Greedo: Hayfield Bonus DK, Duck Egg
(723), Spearmint (727), Silver Grey (838), Primrose (957), Robin DK Mustard
(136).
Nien Nunb: Hayfield Bonus DK, Biscuit (963), Walnut (927), Robin DK Cinnamon (131).
Finn: Hayfield Bonus DK, Walnut (927), Dark
Grey Mix (790), Robin DK Honey (129), Cinnamon (131).
Kylo Ren: Hayfield Bonus DK, Dark
Grey Mix (790), Silver Grey (838), Signal Red (977).
*Edited 4th October 2017* I just realised that I didn't add the yarns for Leia in the bikini outfit from Return of the Jedi.
Slave Leia: Robin DK Brown (051), Hayfield Bonus DK Light Grey Mix (814) or Silver Grey (838), Biscuit (963). Skirt: Merlot (835) - now discontinued, possible substitute Claret (841), Cerise (984), Rustic Pink (635) or Robin DK Claret (032). Bikini: yarn I used is no longer available, an alternative that's more gold would be Hayfield Bonus DK Pumpkin (766).
*Edited 22nd May 2016* Adding yarns used for new patterns.
Porg: Hayfield
DK with wool (shade 92, brogue), Hayfield
Bonus DK, white, Pumpkin (766), Apricot (721).
Jar Jar Binks: Hayfield Bonus DK,
Apricot (721), Oatmeal (964), Robin DK Mink
(143).
Darth Maul: Hayfield Bonus DK, Classic Red (833), Oatmeal (964), Dark Grey Mix
(790), Silver Grey (838).
Ahsoka Tano: Hayfield Bonus DK, Apricot (721) - for alternatives try Burnt Orange (647) or Fox (779). Hayfield Bonus DK, Russet (722) - for alternatives try Chocolate (947) or Claret (841). Hayfield Bonus DK, Light Grey Mix (814), Denim (994), Velvet Plum (906) or Purple (840), Fields of Gold (666).