What an elegant idea! Put stencils under wax paper for chocolate letters.simply trace and then you have a gorgeous cupcake topper. You can also just print out letters on regular paper, put wax paper over, and trace with melted chocolate!
pick a font you like, print it out, cover with parchment and then use melted chocolate to pipe out the words on the parchment. Put it in the freezer for a bit. After it can be carefully picked up and placed on the cake with a bit of chocolate.