so, what if we decide to change our minds and want to use something different?
If your refering to the Sigs posted, I would suggest editing your original sig post with the new image and Put * Updated** in the Comments somewhere, as to make it less confusing for the one having to collect all the sig's to place on the wall. uploading a bunch of variants throughout the thread only lends to the chance of getting the wrong sig used.
I would suggest those with multiples posted already, edit your posts so they all reflect the same sig you want used in the wall.