Tackling your creative minds

I really need to tackle your creative minds with a techy/geeky question.

Veronica received a basic Arduino kit for her birthday.  If you’ve never encountered it before, there are explanations in the link and here is also what Wikipedia has to say about it:

Arduino is a physical computing platform based on a simple I/O board and a development environment that uses the Wiring library to simplify writing C/C++ programs that run on the board. Arduino can be used to develop stand-alone interactive objects or can be connected to software running on a computer (e.g., Adobe Flash, Processing, Max/MSP, Pure Data, SuperCollider).

Here is another interesting discussion of Arduino.

Basically it allows you to add interactivity to objects by hard-wiring and programing the board and adding to various sensors.  We played with it a little bit and made various LEDs blinking in various fancy ways.  But now, we would like to find a more interesting, creative and maybe even (but really not necessarily) useful project.  This is where I need your help.

What would you do with Arduino?

To start the process, here are some interesting ideas we found on the internet:

• Taking pictures triggered by sound, movement, etc. – 1, 2 (super cool!).
• A couple of varieties of POV – 1 and 2.
• Twittering plants and fetuses.

And some claim that this can also be done using Arduino:

They even have a MySpace page, but this is slightly too much for us I think, at least at this point :)

So, what do you suggest we should build?