check out xblights.com for tail light mods... and for headlights...really just HID's that you can get anywhere that sells em. There have also been people on here who have done angel eyes for their bolts kinda like the Audi's.
If you are looking for a mod around your headlight you could look for a headlight grille or do the gas mask mod. Also if HID's are too expensive and you just want a brighter bulb you can look for the white bulbs as opposed to amber. I got a set off of ebay for $8. Not HID but definetly better than stock, and the price was right!