I didn't have a USE for the 30 LEDs
XD That's such a goods reason, you've tempted me to build one! 
I will probobly buy the parts this weekend.
Adafruit sells the LoLshield which is a high-number of charliplexed LEDs.
I found with matrixes once I got bigger than 5x5, it was easier to design a PCB.
The shield looks cool, but it takes away part of the fun - making it!
Although, it looks a brilliant option for bigger numbers of LEDs, and,
as you said, it would be better to just use a PCB for big numbers of LEDs.