Improved Icons

[Jermungandr]

The first link you posted for the background is almost the right thing I was aiming for, but setting limitations to it;
checkbox to trim all empty pixels surrounding the outcome sprite
if out larger than the maximum accepted size, fail.
batch processable.

How exactly do you want batch processing to work here. Are we talking, like, uploading all the sprites to a folder via ftp and just mass-editing everything in said folder like I did with the background remover? Or are we talking like uploading and editing twenty sprite images at once via an on-page uploader. Both are do-able.