The nice short King Queen ambigram displayed to the left is a nice generic design that makes you do a double take.
This preview shows that you can read this as 'King' when the design is upright and as 'Queen' when the design is inverted (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 the King Queen ambigram will appear on everything you see.