I made a pair glasses with LED Matrices on the lenses which I'll be using at music events or clubs. Also as practice for another future LED Matrix project I am currently planning (Custom LED Taillights for '78 Nova).
I chose to use a PicAxe because it seemed like the easiest microcontroller to jump into and hit the ground running. The programming circuit consists of just 2 resistors and a stereo jack. The programming language is a type of BASIC so it's very simple to learn and use (Although the over-simplified language means that sometimes you have to get creative to perform some tasks that would be more straightforward using C)
I used the 20X2 model because since space is limited, I wanted to avoid using LED driver chips; the 20X2 has 1 input, 1 output and 15 configurable pins that can be configured as either input or output. The glasses have a 5X5 led for each lens that I wired as one horizontal 5X10 Matrix and therefore required 15 output pins.
***UPDATE*** VIDEO ADDED ***