Again taking a page from the muscle car world, Wrangler owns too can spruce up their rig with a new set of valve covers (or a cover, for those with inline engines). The older YJ and TJ Wranglers powered by the tried-and-true 4.0L inline-six are equipped with a metal valve cover from the factory. The design philosophy back in those days was certainly much different than from now and thus the valve cover is quite visible and not obstructed by an engine cover. Swapping the cover out with something other than black is an easy way to really add some appeal to the engine area. In fact, if you have the time and patience, you could easily repaint the cover yourself.
Newer JK and JL Wranglers with the Pentastar V6 use plastic-molded valve covers that are mostly kept hidden from view via a top-mounted plastic engine cover. Changing out the muted black plastic covers will definitely change the atmosphere in the engine bay, and for full visual effect, leave the OEM engine cover removed.
While on the topic of valve covers, another item to customize could be the vacuum and breather hoses that connect to the valve covers. Using a colored or braided stainless steel are two ways to add a unique touch down there as well.
One thing to note – whenever removing a valve cover it is always recommended to change the gasket as well. This will prevent annoying leaks on reinstallation, and, given the low price of a new gasket, is cheap insurance.