I crocheted a cardigan for my daughter. I adapted Dedri Uys's "Sophie's Universe" CAL, and added quite and amount of extra rows here and there plus the sleeves. The original pattern is available at several sites e.g. here: http://www.lookatwhatimade.net/.../sophies-universe-cal.../
or you can watch it on YouTube (as I did).
It took several months to finish, 'cause I got bored with it sometimes. and also tried several versions for the sleeves until I said yes to the end result.
Here I started to leave slits for the sleeves.