Thanks to the prevalence of bright RGB LEDs you can now create all sorts of useful and artistic lighting creations, and one example of this is by Suzanne Fluty. In this example the colour is proportional to the values received from an accelerometer - and thus the tilting light is created. By adding a neat frame and covering the final product looks good and can display all manner of lighting effects, as shown in the following video:
With the right code this could be used to create gentle yet random lighting effects to help simulate the feel of outside light. For complete details, check out Suzanne's Instructable page. And for more, we're on facebook, twitter and Google+, so follow us for news and product updates as well.
If you're looking to make more creative designs with LEDs, consider the 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.