I've had mostly family sedans, so not really too many mods available (or make sense). I would put rims on my wife's bucket, but she wouldn't care. I do need to replace the headlamps, as after 20 years they are a little yellow and cloudy (I could polish them out, but a replacement set of lights is under $90, so it's not quite worth teh effort).

Adding LEDs is always tricky. If the car has projector headlights, LEDs are a bad idea (light won't disburse like it should, as the projector housing is made for a halogen bulb, so you don't get the beam pattern you need AND blind everyone else in the process). Having to wire up ballasts and Can-Bus can be finnicky depending on the car too. I want to say legally the light upgrades are for off rode use only, but unless the cops in your area are super strict there isn't too much hassle.