I do! I started painting roses on buttons because I wanted to have something unique to add to crazy quilting round-robins. At first I just painted roses but then added a fish for an Aunder the sea@ block , a dragonfly for a garden block and a barn for a farm blockY Eventually I started doing birds, bunnies, kittens and my favorite B cottages.
In the beginning I was always in search of suitable buttons but I happened upon a large supply of MOP buttons from a long-defunct factory that produced buttons in the 30s and 40s. These vintage buttons have a mellow luminosity that comes only with ageY My buttons are 3/8@ to 1 2@ with 1@ buttons being my favorite. If you are interested in painting on buttons I have a tutorial on my blog, http://olderrose.blogspot.com
My buttons are on Etsy (http://www.etsy.com/shop/olderrose ) and it gives me great joy to know my buttons are being used by others, not only for crazy quilting but for making jewelry and other crafts as well.