Most likely what you saw were not screenshots of the regular Windows taskbar but screenshots of ObjectBar or DesktopX, or something like that that replaces the regular taskbar.
But there are indeed programs that will replace the regular Window clock by a skinnable one. Chameleon is one: http://www.softshape.com/software/desktop/chamclock
Another one is Tclock - http://homepage1.nifty.com/kazubon/tclock/indexe.html
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