Ryzom has been released under AGPLv3 for server, client and "content creation tools" and BY-SAv3 for 17463 png image files and 7553 max 3d model files (see ). The 3D format is problematic, as .max is a proprietary format, but art is also available in the NeL shape format in ryzom's media browser (maybe not all of it, I'm not sure).
"Porting the art" is one of the tasks for which Ryzom will welcome developer support. Finishing porting to GNU/Linux is another goal and I'm sure there will be a little more coverage about the game here on Free Gamer and on other blogs once it runs. :)
I think most ground textures I saw were rather small (128x128) but of high quality and also include to-transparency alpha-blend tiles that are helpful for transitions between ground types. There are also in-game icons and GUI elements.
Here are the most popular resolutions, if you're curious:
files resolution 5493 256x256 2243 128x128 1864 256x512 1422 32x32 1337 64x64 1142 512x512 646 24x24 613 128x256 316 40x40 238 64x128 199 256x128 137 1024x1024 121 4x4 116 16x16