Matthew: Here you go.
Get some cool knobs to play with, and blue lights to look at as well.
There are other options with fan splitters, and Molex adaptors to power fans off spare hard drive connectors too. But those don't have blue lights.
If you want automated fan speed. Arctic sells fans labeled PWM PST. Which can be daisy chained on one connection.
You can also buy 4pin PWM fan splitters. To use multiple fans on one header. One fan acts as the master controller and attaches with four pins, setting the RPM. The remainder are slaves connecting via three pins, accepting the speed. I believe all fans must be PWM (4 Pin).
This PWM splitter is the same thing as the PST fans from Arctic. The Arctic fans just have the function built in.
many case fans come with an extender to bridge the gap between an existing power connector.
look for one of those fans, and connect it between another fan's connector and the power cable.
Directly to the power supply as always on, or through a fan controller.
Get a fan splitter for the molex 4 pin of the power supply.