I'm going to try something a little different. I want to aim them inwards (horizontally) instead of up. Illuminate the car as mood lighting. I'll use aqua (stock greenish) and red LEDs on my relayed circuit so while cruising it'll be a dim aqua glow and red when opened.
I do like the idea of installing in those pieces. It's a very easy and functional location. Did you sand your LEDs flush.