We live in an apartment. We are not allowed to paint or hang window treatments. Had I known 4.5 years ago that we would still be living here, I would have probably broken the second rule, but now it seems far too late (with the two munchkins, we are fast out-growing this place). So, I like to decorate for the holidays in ways that add at least a little something to the ugly blinds.
I happened to be at Ikea shortly after Christmas and noticed some cute little red and silver heart-shaped ornaments on clearance. I picked up a few packages of them thinking they'd be perfect for Valentine's Day (hearts at Christmas???).
I decided to make a little garland with them over our main window in the living room. I bought a roll of Valentine's Day ribbon that wasn't too tacky and used other ribbon I had on hand to tie the hearts on.
The whole thing cost me less than $4.00.
Moral of the story: watch those awesome post-Christmas clearance sales. You never know what you will find and how you can re-purpose it for other holidays.