So, after looking at Masterlegodude's tutorial, I decided to share some of my own creative eventing knowledge.
And yes, this is simple, and many may know it, but I thought the people who didn't might find this useful for a sci-fi build or dance pad, or whatever =P
So, this is really simple. This basically teaches you a cool way to make a color pad that senses where the player is.
Example pic:

Thats the finished product for what I used this for.
What to do: Make a new brick, I used a 1x1 flat with a print of nothing for a sleek look. Then, you add these events to it:

Then just duplicate that to make a big square like in the other pic and then walk over it. There should be a trail of color following you.
And BTW, pics really don't do this justice. I recommend you try this before you flame me about how it doesn't do anything.
And dont be afraid to add different colors on them. It can make it look 10x cooler, but takes 10x longer.
And finally, for the lazy ones who dont feel like re-making it, here is my save.
Note: The pad is in the secret bed easter egg that everyone should know by now.Link:
http://www.mediafire.com/?zhkfbawnmzn