I found this link on the other day (posted by Baby Panda[Solomid]) that lets you not only look at all the released skins out there, but play with them as if they are digital action figures. The website is a Chinese LoL fansite, but all the champion and skin names are in English. Skins are frequently updated with the latest release.
|Firefang Warwick (Click to enlarge)|
- All released RP skins for preview (including ones that are no longer available
- Preview in 3-D
- Rotate via dragging with mouse to any direction
- Mouse Scroll-up/down to enlarge/shrink champion size
- Additional champion stats & skill info (in Chinese)
Good luck and have fun!