Check out Colonial Pattern Co. At one time they had preprinted blocks for embroidery and painting. You might also look at the preprinted mini wholecloth from The Stencil Co. These may be larger than you want and more detailed, some have completed them in embroidery. You might also check
http://alc-quilt-shop.auctivacommerc...aspx?sid=19708
I accidently came up on this one. I don't know if these are already embroideried or printed for embroidery. If you can't get it with the address above then look for ALC Quilt Shop