A few months ago we showed you an interesting macro lens here that was embedded into a durable rubber band, but we think this 8x sticky mounted macro lens has that one beat majorly. It’s just as easy to affix to your iPhone 4 or 4s, thanks to a reusable gel pad, and it appears to really pack a punch based off the sample images. These are now available for $69 at Etsy. See how the lense performs below (We are impressed!).
You can see examples of photos taken with this lens and similar lenses at the flickr gallery.