while looking for a special envelope pattern (still looking btw *hint hint*), I came across this site that sells templates of "DIY gift packaging" and they look like real simple papercraft stuff.I guess it would look very nice as a gift box, you wont have to go find wrapping paper... but man, watching someone take it apart (even if its simple crap) would be kinda heartbreaking!
I think this site has a lot of boxes/envelopes for various occasions.http://cp.c-ij.com/english/3D-papercraft/event/index.htmlenjoy!
http://www.ghh.com/elf/This site has a bunch of origami envelope folding things... Also, for a more papercraft-ish envelope, see attached file.