This is a suggestion for your project ... since you might have a Bluetooth
enabled gumstix, the company that makes the Basic Stamp has a bluetooth
enabled receiver that you can use with the basic stamp.
Would make it easier to make you little device possible to use with any
operating system as long as you can develop a software to go with it.
The reason I`m telling you about this product is because it`s very easy to
make a project with their products.
You could even have a little Bluetooth enabled LCD that shows messages.
Parallax also includes examples of how to control tri-color leds with their
basic stamp. This would allow you to give more flexibility to you little
"Led project" having leds capable of displaying different colors.
Anyway .. good luck with your project. Sounds like a cool Idea so far.