The nice short Ring Ambigram displayed to the left is a nice generic design that makes you do a double take.
This preview shows that this design reads 'Ring' when upright and also reads 'Ring' when upside-down (or is it the other way around?).
Roll your mouse over the design to the left to see it rotate.
If you like this design, here is more good news. You can purchase anything in the FlipScript store with this design. All you need to do is to click on a category in the red bar above and every product will display the Ring Ambigram.