Like Tami said, there are all sorts of ideas to make very inexpensive trophies.

If you have seven fleets that get trophies, have each fleet come up with an idea for their three trophies and MAKE the trophies. (Give them a deadline to have their trophies done, though.)

Trophies like that would all be much more unique and creative.
AND it gets people more involved in contributing their talents.