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Patch cards are a variation of jersey cards, and are usually more desirable than their jersey counterparts. They are almost always more rare, and quite often more visually appealing than a plain jersey swatch. Patches can come from team crests, shoulder logos, numbers and name bars on a jersey. The more colors on a patch card, the higher the cards value is.
Some of the Nicest Patch cards come from Chicago Jerseys. Here are some examples

Eric Lindros Premium Patch 2005-2006 Ultimate

2001 Upper Deck Game Used Patch Maury Wills
2004 Upper Deck Game Used Patch Pedro Martinez

Other patch cards have the NHL logo on them. Like the following