Step 3Prepare The Clear Poster Board
iImage Information

I first did a search on Google Images for a suitable snowflake outline image to create templates. I re-sized the image to fit within a 2" square and printed several on each page of plain white paper with about a 1 inch border around each snowflake. I then cut the clear poster board into 3" squares and taped a single snowflake template in the center of each one. Be sure to leave the protective paper on the plastic to keep it from scratching or scuffing. Then placing the plastic squares on a few layers of cardboard it was time to start poking holes with the push pin to transfer the pattern to the plastic. If you are making several cards you may want to make a better, more comfortable push pin (my fingers got sore) by inserting a medium sized sewing needle backwards into the end of a wooden dowel. After the pattern is completed, I removed the paper template and the protective paper and cut a small groove at the bottom to accept the crown of the LED.
An awl sounds like a good idea but the holes would be large and may distort the plastic too much. I have since made handles out of wooden dowels and glued sewing needles into them (drilled a small hole in one end). It helps since your fingers tend get tired pushing a push pin several times.