This clear piece of plastic was marked with a black Sharpie and then colored with the pens.
|White Shrink Plastic
|Matte Shrink Plastic
|InkJet Shrink Plastic
As the plastic heats, it will curl. To keep the edges from curling over onto the center, cover the plastic with parchment paper during heating. When it has finished shrinking, the edges will uncurl and lie flat.
Use your heat tool to melt the edges in order to hold them together and then remove the rubber band. Continue heating it until it has shrunk to its intended size.
The inkjet type of plastic is the only one of the four that you can run through your printer. Find a suitable photo and edit it to fit to your half sheet. Cut out each photo so that it will shrink separately. I was able to print two photos on my half sheet. You must lighten your photo quite a bit because as the plastic shrinks, the picture will become more intense.