I love discovering fun online tools, especially when they're free :)
Dumpr is a photo and image editing tool that I came across at the beginning of the year. It has some really nice effects available. A few of the effects that used to be free are now part of their paid "pro" package, but there are still enough free ones to make it worthwhile checking out.
I especially like the Amazing Circles effect. It doesn't work well with every image, you'll have to try a few to find out for yourself which ones you like. Here are a couple that I think turned out well - I've included the originals here for comparison.
Tulip at Floriade 2007 with Amazing Circles effect applied:
![Floriade 2007 - Amazing Circles](http://farm3.static.flickr.com/2597/5839202122_8471ba65d1.jpg)
Original photo:
![Floriade 2007](http://farm5.static.flickr.com/4046/4491446881_1b6308d12a.jpg)
Lotus pond at Botanic Gardens of Adelaide with Amazing Circles effect applied:
![Nelumbo Pond - Amazing Circles](http://farm4.static.flickr.com/3487/5838651911_80795f28ba.jpg)
Original photo:
![Nelumbo Pond 2 - Botanic Gardens of Adelaide](http://farm4.static.flickr.com/3541/3813312945_42195366d8.jpg)
I also really like the Rubik's Cube effect. The Christmas Ornament and Museumr effects are cute too :) Why don't you give it a go?