You'll either need to use some kind of graphics editor (thegimp - free) photoshop (expensive) and a cheap alternative (fireworks) Or locate some pre-made custom sub forum icons. All you have to do is overwrite the existing sub forum icons with new icons by uploading the new icons via ftp to your /statusicon folder.
No templates will need reverting (if I understood you correctly) as your only dealing wwith overwriting an existing image.
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