Although I have never done it myself (yet) I understand you can print your own decals on glossy white self adhesive film (Apollo Inkjet Film # 17320 at Office Depot) (and NO, I don't work at Office Depot). I found this on a forum once and took the info. You have to fuel-proof the decal after applying it; I guess I would try balsarite (any ideas about fuel proofing without making a smudge?)
Luis