Picnik makes your photos fabulous with easy to use yet powerful editing tools. Tweak to your heart's content, then get creative with oodles of effects, fonts, shapes, and frames.
Simple creative commons search tool for Flickr pictures
"This is a wee test search for creative commons flick photos, click on the thumbnail to see a small image and get the code to embed the photo with attribution on your blog. When you see the code you can toggle left/ right alignment and small/medium size. If you are allowed to you can edit a large size in picnik, you will need to handle the attribution for this yourself."