There's a guy in the mall, can't be much older than me, maybe early 20's. He has a kiosk for stickers, license plate frames, t-shirts, hats, belts, etc. I go to him whenever I need stickers for my truck. I took him a T4R.ORG sticker, and he scanned it, then made me a bunch with the individual letters, instead of the clear vinyl like greg has now.
I asked him if he had anything with Lamar or Burton, and he didn't, but told me he could scan anything I wanted. Rather than come back, I just had him type "BURTON", then delete the "O" and edit in a skull from his files.
I'm sure most sticker kiosks, stores, etc, that advertise "custom stickers" can do the same things that he does.