Another college student here. I know what you mean.
How about a clear bumper lens?
You could also do "cheaper" stuff like painting your interior or your engine plastics, maybe even paint your stock rims if you like, redout your tails or get overlays (not sure how expensive those are). Cruise around the Group Buy and For Sale forums and you can find some pretty neat stuff there.
Alternatively, you could do like I was a week ago: saving my money like crazy to get several mods at once. I broke down and signed up for the Carbon Fiber dash group buy, though, so there goes that idea...
EDIT: stupid me, you already have TYC tails...never mind about the redout.