I really like and appreciate cases that have a slot for ID or credit cards for when you don't want to carry too much. A found a couple of really cool such cases.
Red is one of my favorite colors and Cygnett has a really beautiful feminine case called Glam. It has a magnetic closure and a slot for a credit card or ID card.
Skech also has a nice case with slots for cards. It was debuted at CES and is made from recycled tires! Each case is slightly different.