(This has been posted on the web before, but the site was closed.)
Although painting a case isn't that exciting of a mod, it really brought my case to 'life'.
I had been collecting almost empty cans of primer from work that had been thrown out. I used these to primer my entire case.
First coat was a can of neon yellow which I bought.
After the paint was dry, I laid out some flames using painter's tape.
The flames were painted using a can left-over of 'upside down' landscaper paint. While the paint was still wet, I 'misted-sprayed' some left-over blue on the neon lime-green paint.
Cost: 1 can of neon paint. (All other paint and materials were scrounged)