Quote Originally Posted by Epistolary Richard
If every user on this board could be trusted to host an avatar that was suitable and that did not breach the forum rules then I'm sure this would be an option.
If you're referring to the size of the image by that, vBulletin automatically checks the physical size of the image and how many pixels it takes up. But, since you're probably referring to someone posting a picture of a nice pair of breasts, wouldn't that problem also be prevalent in custom signatures?