In chronological order:
1. The rings
2. Diggory and the Tree
3. The Tombs of Calormen. That's Bree in the background
4. Probably a pair of matching royal rings representing Cor and Corin
5. The sword of Caspian... or Peter?
6. A 'Dark' Dawn Treader
7. Prettier Dawn Treader complete with scary wave-face
8. Red-Dawn Treader
9. The Green Snake which used to be a beautiful green woman
10. Rillian destroying his jail
12. Bright, more girly Jewel. :p
Credit goes to Barnes & Noble fromw here I got scans of the cover arts. All the icons are crops of those scans, with a little artistic modifications here and there.
Please comment and if used, please credit. Thanks!