by AvidReader » Tue May 30, 2017 1:01 pm
Design them in vector format (or if not your thing, lots of pixels and scale down, never up).
DIY, get inkjet paper or laser paper (different, so beware), and print them. No whites, probably a bit transparent.
More pro, find a place (t-shirt and mug customization are good starts) that has dye sublimation (IIRC this is in the way out) or special purpose laser machine (CMYW, W, not K), you will get whites or even more complex features like trimmed carrier. I think I have a couple of bookmarks somewhere, but never used them.