My inner geek, which is maybe not so hidden anyway.

I don't usually go ga-ga over anything technology related, but I loved this site.
Jason and I just spent the past few minutes entranced by this thing called a Tone Matrix.
Basically, you click on the little cubes and make your own melodies.

Here's an example of Tone Matrix at work:

Fun!

Others I liked:

• Pac Man (YES PLEASE!!)
  
• Tone Wheels
  
• Color Traces
• Cubic VR (which kind of makes me nauseous.)

Also, here is a joke desktop image I made a few years ago (since we're on the topic of silliness.)
You can thank me later for the nightmares.