Ricer-ish? Hot rods have been using the small LED license plate bolts for a while now. I haven't decided on what I'll do. I don't drive my Jeep at night anymore so I'm ok for now. I want something small. There is no point in removing the stock lights just to add something big in their place.
The bolts are probably the lowest profile, too. Only problem is that they're a bit pricey.
There is also this but it's $30.
Oh and to give you an idea how much this project will cost;
Incandescent - $6-8
LED's - $20-30
Flasher - $8-15
Reverse - $6-12
License - $6-30