Nah, don't worry about template edits, its unneccersary.
What I do when editting a style, is change the actual image itself. I don't have aproblem with this as I always make sure I have access to the originals and all that.
Going through and editting the templates just gets messy.
The only time you'll have a problem is of the img tag has width and height elements, and your new image doesn't fit. Then you may need to do some edits but until then, assume a simple replacement image will work.
Hope I've helped, if you can give us the forum software I can tell you the path.
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