After being in the US mail limbo for 22 days after it shipped, I finally got my Zagg Invisible Shield for my iPhone 4. There's also a green bumper from Apple on the phone.
Click image to view full.There's also a clear one on the front. I'm pretty happy with how it turned out. It actually looks better in real life than it does in the photo above. You never know how vivid the colors are really going to be when they print it. It's made out of the same material they put on the leading edge of helicopter blades to prevent abrasion from sand and dust.
It's a custom design, I made it in photoshop. I took a picture of the Flying Spaghetti Monster from Venganza.org. The background came from NASA, it's a photo of the Aurora Australis (Southern Lights) as seen from the International Space Space Station.
Here's the original pic I sent to Zagg to make the skin.
Click image to view full.