For my 30th Birthday I decided to have a D-Themed costume party, my girlfriend Kylie and I decided that we would go as Daft Punk. The costumes were quite involved to make, but we had lots of fun and they looked great!
We used a lot of resources from the internet, including a great article on how to stitch EL wire into clothes that I found here: http://www.instructables.com/id/how-to-add-EL-wire-to-a-coat-or-other-garment/
I also learned a lot about prototyping boards (particularly the Arduino, and its clone the Seeeduino) and really enjoyed tinkering around with LED Arrays, learning the difference between common cathode and common anode, figuring out how breadboards work, and just generally collecting heaps of post at work from various electronics and EL wire companies.
Here's a few videos showing the final result, so you can decide whether you want to bother reading any further: