I have just joined a robot team which 3D prints a lot of parts for the robot so they taught me how to design things in Creo. I did this yin-yang symbol for this envision the future design challenge. It is nice if the parts are printed in different colors, though some partially sighted people may not be able to see them. The yin and the yang fit together very nicely and naturally.
It is hard to get the braille dots to print well, a very fine layer helps this.