recommend reading up on how to use cfc-gui, then you can get rid of anything you want. more work than doing cabs but it's work to find the right cab sometimes too. like one removes unwanted background entirely, another makes them transparent but still clickable, another makes them partially transparent, yet another makes it look like glass with nice edges. pain in the ass finding just what you want. learning to edit your own is easy and you can make it just how you want. try post 19. clock stuff is under the home category.
http://forum.ppcgeeks.com/showthread.php?p=1923022
or for cabs,
http://forum.ppcgeeks.com/showthread.php?t=102324
the orologio one rocks but it's better with a custom clock font on that nice glass flipper