As there are requirements for large size icons in apps like GNOME Do 
and Elisa , I recently started working on Mist icons with a bigger,
256x256 canvas. With some assistance from Kalle Persson and Hylke Bons,
I now I have something that is usable and will try to merge these into
gnome-themes trunk next week if everything goes well. It takes a bit of
time to put these together, because of the level of detail (textures,
shadows etc.), but I only have some stuff like folder-open left for it
to be fully usable.
There is also some action going on in Gossip  and Banshee  trunk,
but help is greatly needed for other apps, so if anyone is interested in
helping out, you're more than welcome.
You can find the icons here: http://www.andreasn.se/diverse/temp/Mist.tar.gz
and a preview here: http://www.andreasn.se/diverse/temp/mist-preview.png
Just unpack the attached file in ./icons in your home folder.
Hope you like the icons!