This info graphic guide by Vectortuts user Jonathan blew me away. I putz around in Adobe Illustrator from time to time, but I’ll be first to admit that I basically have no idea what I’m doing. Maybe after running through a few tutorials like this I’ll be able to fake it.
There are some really good tips in here, including how to illustrate from a photograph, choosing line weights, and cleaning up the rough edges.
I have a bunch of them – I got them from SuperBright LEDs. According to them, you don’t need resistors, they’re built in. And if you hook a bunch up together, they’re not quite synced, so they change color in unison for a while, then it gets chaotic – very pretty!
…’course you have to buy 100 of them, but that’s including shipping from HK:
http://cgi.ebay.com/100-5mm-Colorful-Slow-Flash-RGB-LED-FREE-RESISTOR-SCF5_W0QQitemZ290266333950QQcmdZViewItem?hash=item290266333950&_trkparms=72%3A1205|39%3A1|66%3A2|65%3A12|240%3A1318&_trksid=p3286.c0.m14