After you cut your stained glass pieces you are going to want to number them so that you can properly arrange them prior to pouring your cement. If you have a simple design you can skip this step but for intricate designs this will make laying out the design easier. You will number the glass pieces with a marker as you cut them. The pieces are going to match up to the full size pattern that you will use to lay out the glass.
The widget below features diamondcrete, stained glass patterns and a nice program for resizing patterns called rapid resizer.