What would you do with $4000?

Since we bought a house in 2009, we get $8000 back on our taxes at the beginning of the year! Hooray! As much as I'd love to go to Europe, Australia, and New Zealand with that money, I'm a bit too practical (bummer, right?). We've decided to put half of it towards our savings account (gotta save for a rainy day) and the other half toward our house, the best investment we could make. So, that gives me $4000 to play with :) So, what would you spend $4000 on for your house? We're thinking about kitchen improvements and our yard, but what would you do? You might have a suggestion that I never would have thought about, so please, GIVE YOUR IMPUT!!!