The Medical Decal here was from the pattern files I made here, and the barcode is actually my birthday for some extra flavor. The weathering of it is entirely unintentional as my printer was running out of ink so it didn't give proper coverage. It was cut out on a CameoPLUS machine
Its a think piece of acrylic that was first coated with car window tint. I measured the rough size with a piece of card stock and traced it with paper from the outside. Add an inch around the perimeter and scored the acrylic