If your household celebrates Halloween, now is the time to consider some decorations, and one Arduino-powered example has been described by Bobbi Stromier with their TMNT pumpkin.
After carving out the face of the required character into the pumpkin, an Arduino controlling an RGB LED is fitted inside - and will run the whole night from an external battery. Although this is a simple project, it's perfect for sharing with younger children and exposing them to the world of electronics. Plus it looks great, as shown in the video below:
If you're looking to make your own colourful LED-based project, consider our Freetronics RGBLED: full colour module. It includes a bright RGB LED on the top of the board and a WS2801 constant-current, addressable, multi-channel LED driver on the back. This smart module can be daisy-chained, so you can connect a number of these together in a string and drive each of the module colours individually from your microcontroller. For more information and to order, visit the product page.