I keep meaning to do that. I was thinking of just printing off the name and a gap for the number, with perhaps pawprints or pictures of my dogs round the edge, and then laminate it at work so I can write on it.
I'm just doing mine for our breed club show this weekend as it will be unbenched I've just done a square box in excel with a thick black outline, then put affix, name & tel then a nice picture of one of our dogs with an empty space to put the exhibit number. I am going to laminate them so we can use them again