My son, home for the holidays, wanted to build an alarm clock that would wake him gently in the morning with lots of light. He lives in a basement flat out West and does not receive much natural lighting early in the morning. He plans to install 5-10 metres of inexpensive RGB LED light strip (see previous discussion) around the periphery of his raised bed. When the alarm activates, a cycle of slowly pulsing light emanates from below the bed. He is holidaying at the right place!
A software and hardware design made for hacking!
Here’s a video of the (nearly) finished clock: