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I've seen a few guides out there on how to add an ocsilator into an LED fan for some interesting results, but I noticed that no one has done anything with the RPM sensor lead, would it be possible to use that to time the flashing of the LEDs?

Flashing and/or color cycling LEDs are obnoxious. Don't do it. I have one of these on one of the fans in my case, and it makes the inside of my PC look like a disco. It is distracting.

Much cooler is the ThermalTake CoolMod which I have on another fan. It glows a nice blue whenever the PC is on, and it flashes red when the IDE hard-drive is busy. (I wired the case hard-drive LED to my SCSI host adapter.) So, you get the cool color change and blinking lights when the PC is busy, but when it is just sitting there with no disk activity, the colors do not blink or cycle.

The idea is to have it flashing than 40hz, so you don't notice the flashing, but it still produces cool effects, i.e. making the fan blades appear to be standing still, or rotating backwards.

Splinter wrote:

The idea is to have it flashing than 40hz, so you don't notice the flashing, but it still produces cool effects, i.e. making the fan blades appear to be standing still, or rotating backwards.

I would have thought it would have to flashing much faster than 40Hz...

Since monitors need greater than about 72Hz to avoid flicker...

But I may be comparing apples to big elephants ,
IntelMole

You don't normally watch your case fans

The problems with flicker have to do with syncing, since there is nothing really to sync in a fan, it isn't a problem.