For those who are fortunate enough to have or have access to an ALPS
printer, Papilio sells "water slide" decal paper in 8.5x11 sheets.  You just
print on it with your ALPS printer (won't work with ink jet) and then cut it
out.  Presto, decals, which the company says hold up fine on cars.  The URL
is below.

http://www.papilio.com/paspaper1.htm