Take one standard keyboard, add some cotton or other absorbant material, sprinkle in a healthy dose of chia seeds, and Voilà ... you have your very own Chia keyboard. Looks like a great prank to pull on office mates, just make sure to water lightly, and only with the power off. http://ifun.ru/comments/joke11909.html (note: ads may be NSFW) - Thanks John!
And here's another site offering some instructions on creating a similar keyboard garden