I'm doing some research on color perception shift, and I needed a portable device to change the R,G,and B brightness on an LED. Enter my arduino. Check out how tight I got this breadboard, zero wiggle room. (The additional power wires to the right are in case I want to add a switch.)
The back is a little less organized but still pretty uncluttered.
The project can also be controlled over serial.
Originally, I was going to put it on some perfboard with a dedicated ATmega but I think I'll actually just leave it as it.