I did this same thing to my prix. I took a few steps further, though I like this install, very clean, especially your button! Fantastic. I added 2 more LEDs under neath the radio in that little cubby. Not a distracting amount of glow, but just enough to give that ambiance. Here's some pics of mine:
An overview: you can see that I have 2 in the cup holder and then 2 little ones in the cubby:
The switch that's in the middle console:
The steps were quite simple: I tapped into the power from my aftermarket radio, dropped the wire behind the back, under the middle section, straight into my middle console to the switch. Then I drilled holes and installed the LEDs and ran the wire by my gear shift then put all the wires together and ran one single wire back to my switch to provide power.