This case caught my attention, it's called the Glam Rocka by More. Thing. It's essentially a jelly polymer bumper style case for the iPhone 4 with a more interesting look. The pyramid texture on the sides looks like it would provide a decent amount of grip to your iPhone 4. The Glam Rocka is made to snugly fit around your iPhone 4 and it's available in five colors for $12.90, not bad eh?

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