You can also do a "reverse" stained glass. One large piece of black fabric (the size you want your quilt to be PLUS an extra allowance on all sides for sandwiching and quilting). You can then applique (any technique) your color blocks onto the black fabric. Carefully cut away excess leaving just a narrow bit of black. This technique works really well when doing stained glass pictures (think Tiffany windows, etc). Hope this makes sense.