I am a bad programmer I do not know the languages well. I have made an algorithm for a decal editor to be applied to existing aircraft or vehicular models/ open source programs.
Hope you like it.
Edit:
Posted as a wiki entry for now on google sites. Like a cookie cutter cuts out shapes, we could make decal templates, etc. for each aircraft.
http://sites.google.com/site/rico001flightgearwiki/home