Advice- Need a Hack for Motion Sensor and LED

I am new to this electronics thing and could use some advice. I am trying to build a very simple prototype for a ceiling made of LEDs or EL panels that would light up when people walk below.  It will need some kind of motion sensor or infrared sensor.

I was hoping to hack an existing product that has both parts. I am not very experienced with this kind of thing and don't have a lot of time to learn before this project is due.

Anybody have any ideas?

A motion-activated LED outdoor floodlight like this one would contain all the bits you would need. Might have to hack a bit if you want more than one flood to go off of the same motion sensor, but that's not a major hack.