I have created an icon pack containing 4500+ WoW icons in .PNG format (60x60) for use as forum avatars/mod resources.
Also made another one with a selection of 235 WC3 icons.
All images have had the 'border frame' removed and are sharpened very slightly. If you want to know how I did it I also made a tutorial with .GIFs explaining the process.
Hope this is of use, cheers :)