I drew some sign sheets for my layout several years ago. I've posted them below. After printing them out, I glued them to a thin sheet of plastic with Walthers Goo. I then used ACC to glue the signs to .020" bronze rods. If you're unfamiliar with the meaning of the signs, you can refer to to the "German Railway Signalling" article on Wikipedia.
Below are the slides from my signal presentation of October 12.