I have been doing this by adding the used grounds to the garden and planters. It is easy to just dump them in and spread them around.
I will also be trying to use them as ant repellent. I noticed a huge ant hill in my yard today.
Here are a couple of links that share many more ways to reuse coffee grounds:
http://www.curbly.com/DIY-Maven/posts/1881-Top-1-Uses-For-Used-Coffee-Grounds
http://www.greendaily.com/2007/12/28/21-ways-to-use-old-coffee-grounds/
Shannon
I drink a lot of coffee throughout the day - so therefore I have all that I need to try this out