Producing wine stoppers in pairs was the most popular gift idea of the 2009 Christmas season. Here are two examples of how these can be turned as identical twins. The set on the left is Purple heart and the pair on the right is Zebra wood.

 

 

Here are more in pairs. From feft to right:   Zebrawood, Lignum Vitae, Paduk, Claro Walnut, Canarywood, Marblewood, and Jobillo.