I made a quilt using bubble set (or some such name) to pretreat the fabric. I then printed it with my ink jet printer after fusing the fabric to freezer paper. To test the fabric for colorfastness, I threw just a printed picture (about 4x4) into the wash with my regular load. I figured that would be the worst-case scenario test--to treat the quilt like a sheet or pants. Anyway, after being washed without any special care, the block survived beautifully--no loss of detail or color.
Laurie