Cecil writes in –
I was in the process of creating a red, green , blue color cycling circuit based on a PIC microcontroller when I spotted the Glade LightShow air freshener. I wanted to know if it could be hacked up and used for other purposes. I found a couple of online coupons and when it went on sale in the store, I got 2 for $3 a piece.
RGB LED color cycling with a Glade LightShow air freshener – Link.