You no longer need to buy expensive photo editing software to do creative things with your images. Go to the following sites instead:
This is a very simple site. Upload your image to the page and you can resize, crop, add text and add a number of effects, then save back to your documents.
You need to sign in (which is free) to this site. It does similar things to Wiredness, but you can also add speech bubbles, merge photos and add a few more effects.
This site has a large number of ideas for things to do with your images, for example:
1. Make a calendar.
2. Use the Warholizer.
3. Create trading cards.
4. Create a Hockney-inspired photo montage.
5. Make your own magazine cover.