Your skills and knowledge are under utilized.
There are people who could use the skills or knowledge you have.
Start a training class during lunch (your boss doesn’t care what you do for lunch, see this post.) Pick a subject you know something about (i.e. project management, Excel, blogging, leadership, twitter, social media, giving presentations, etc.)
It doesn’t have to be fancy, you’re just sharing something you know.
Tell all your friends at work about it, make some flyers to post up on bulletin boards or other places in your area (or out of your area, if you prefer.) Send a unique email announcing the event to various distribution lists.
Try to collect the names and email of all those who attend, so you can follow up with them for future classes.
Don’t worry if you’re not the complete expert on the subject, just remember, in the land the blind, the one eyed man is king.