Picnik is a create photo editing site that enables a multitude of effects that can be used on photos.
This would be of benefit to art classes, students could be assigned photography assessments, which they then need to edit in Picnik in creative ways.
Picnik works with many platforms, extracting photos from social networking sites and photo feeds, to use the photos that you have already posted on the web (Picnik 2009).
It is a helpful tool for users who do not posses any photo editing software on their computers, as it fixes photo impairments, re-sizes, crops and applies fun effects.
Here is an example with a photo I edited from my Facebook account:
Picnik 2009, 'Photo editing made fun', viewed 18 August 2009, http://www.picnik.com/