Custom Decals & Stickers, Design Online, Design Decals Online, Online Design
You can have them make whatever you want. Upload an image or do text only in a variety of fonts. They have a few sizes to choose from, but you could always have you're image or logo or whatever printed on an over sized sticker and cut off what you don't need.
I found this site because I'm thinking of ordering some stickers for my tank on my new build, but I wont know what I want on it until I see it built and ready to ride.