I dont need to write much,i only wanted to share with you one free online photo editor that i have just discovered! It's great! you can edit your pictures and save them on your computer! Pixl even has a blog where you can learn new features they have to edit photos like the night vision one or the hope effect. You have it available in different language, have a look!
http://pixlr.com/ (here is the homepage)
and if you want to go to the photo editor directly from your browser go to:
Once you have edited the photos you can upload them directly to flickr,picassa,facebook or your computer! isn't it great? Here you have one example of one photo i have just edited.