I roll my own decals - To make them use a graphics program like Inkscape (free vector program) or Corel or Illustrator - or Photoshop type programs
You can find graphics online - Brands of the World is a great site for sponsor logos
Decal paper comes in clear and white - unless you have a special printer you can't print white graphics - therefore when white writing or the like is required you need to be creative with the white decal paper.
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