Here is one of his few cards that pays tribute to his first gig:
TBCB Muppets - #7 Rowlf the Dog
I really couldn't resist dipping my toes into the Sesame Street pool as well:
TBCB Muppets - #8 Oscar The Grouch
I had forgotten about his best pal, Slimy, until I delved deeper into Muppet Wiki:
TBCB Muppets - #9 Slimy
I feel kind of bad for entombing Slimy, but not too bad... 'cause THAT is hilarious.