Look this up. It is 2011 September Doll Quilt Swap. Scroll from the last page forward and you will see lots of possibilities. Most of these quilts run anywhere between 12" x 12" up to 24" x 24".
http://www.quiltingboard.com/t-146847-45.htm#4292569
If you want even more inspiration, there have been doll quilt swaps going for over two years each month. I think if you do a search on 'doll quilt swap' you will come up with tons of inspiration. You might be feel like joining in on October's swap. There is still time to sign up!