I've seen you guys using the 5 and 25 SMD LED bulbs, but I'm going to try something a little different. It's just a little more pricey than the SMD bulbs, but if my R&D works, this will really balloon this mod up.
For anyone using the SMD style LEDs, I'm sure it's an improvement over the stock set up, but look at the bulb on the left when compared to a 5 LED SMD bulb on the right:
I can get a pair of these 194 based bulbs, for $16.45.
I've already got my stock reverse lights out since I found a set of AAC ones on Ebay for $100 so I'm going to begin this project and test them out.