What: Technology & Learning invites K-12 students to participate in the sixth annual digital photography contest. The competition, open to all K-12 students, challenges you to capture-and share-your unique vision of the world. If you have an artistic side, you also have the option to digitally enhance your photos with your favorite imaging software. The best digitally enhanced photo wins a special prize from Adobe. Other prizes include a digital camera, Adobe Photoshop Elements, and more!
I wasn't sure if it was appropriate to add to this list but I would add SumoPaint to this list. http://www.sumopaint.com/app/ It is an easy to use free online software that works a lot like photoshop. I use it with both my elementary and my college students. Other then that this is an awesome list thanks for sharing.