For the T I decided to use tyvek. I either recycle my envelops or I buy it. Depending on the type of tyvek there is a slight difference in the bubbles you get when you zap it. This piece of tyvek I painted both sides with different colors - don't ask me which type of paint or which colors I used because I have no idea. I did not keep any notes. When it was dry I used my heatgun to zap it. After this was done I cut out the shape of the T and stitched it to a piece of Black Kona.