After you have cut and ground you glass pieces you are going to need to arrange them on a piece of sticky contact paper. Clear shelf paper works great for this. You will lay down a copy of the pattern and then lay the contact paper over that sticky side up. Pin it down so nothing moves. Once everything is in place you are ready to apply your glass pieces to form your design.
The widget below features diamondcrete, stained glass patterns and a nice program for resizing patterns called rapid resizer.