i've gone as far as chipboard, or posterboard, draw design, then cut design grooves with my Dremel engraver... it worked

I've used tissue boxes. The cardboard is thin enough to give a fairly accurate outline, but heavy enough not to fold up the first time around it.

You can also use cookie cutters.

Use old telephone books, cut the page to the size of the block, draft the design, stack 6 to 8 sheets and with no thread in the machine, sew on the line to perforate.

Align the perforated paper over the block, I use duct tape to hold it in place, take talc powder and lightly dust and the design will show. If you are using light fabric, they say you can add cinnamon to darken the talc, I have never tried that, so don't know if it will disappear, but the talc will.

Now just quilt.

I am certainly no expert! but falling head over heals for stained glass recently and here is a site that I hope to use alot. It is really for "the real" stained glass but know that it will work with fabric. Good luck and waiting to see your pictures :)