I know a lot of you Flickr, but have you ever edited your photos in Flickr's sister site called Picnik? It has some really neat editing effects that you can do with your photos. AND IT'S FREE!
There are some premium features that require an upgrade, and I have no idea how much that is. I haven't upgraded. But, I do picnik and I love it.
Take a look at this:
Here is your average ordinary photo (isn't he cute? I found him outside the grocery store one day) but look at what you can do with it once you upload it to Picnik:
There's a focal black and white option (same as photoshop)
You can do an HDR effect (this one is my fave)
Really nice washes. This one is CinemaScope
and some fun effects like Sketch
or you can combine effects. This is a holga effect combined with the vignette option:
The opportunities are endless (and free! did I mention free?)