I have done a few things on commission, but if I did sane quilts (instead of crazy quilts), I think I would tell them to go to the store and buy all the fabric and pattern, and then tell them a commission price you will charge...I bet they walk out of the store without purchasing anything, because they have no idea how much money besides the time that goes into our "hobbies"!!!!
I did a clutch purse for a lady, for $40. and I did a pillow for another lady for $35. Both are on my flickr site....
BJ
http://www.flickr.com/photos/60446771@N05/