From Muppet Wiki

Colorforms toys are paper-thin, die-cut vinyl sheet images and shapes that can be applied to a slick cardboard background board, much like placing paper-dolls against a paper backdrop. The images stick to the background via static cling, and can be repositioned to create new scenes. The original box sets began appearing in the 1950s and featured bright shapes and "modern" basic designs, expanding into cartoon character sets. Later, Colorforms produced box sets featuring various licenses, including TV series, movies, cartoons and toys.

Picture	Name	Year	Description
	The Sesame Street Alphabet Set	1971	Comes with colorform Alphabet letters. Gordon and Susan are pictured on the playset
	The Sesame Street Ernie and Bert Set	1971
	People in Your Neighborhood	1973	The background illustration is a busy street. Four Anything Muppets can be modified to give them different occupations.
	Cookie Monster's Colorforms Kitchen	1974	The background illustration is of Cookie Monster cooking in the kitchen. The set includes ingredients and utensils to create comical kitchen scenes. Illustrations by Mike Smollin.
	Ernie and Bert's Playtime	1974	The background illustration features Bert sitting in the living room, and an open door leading to the bathroom. The set includes Ernie, who can be placed in the tub, and a collection of toys and games. Illustrations by Mike Smollin.
	Big Bird Colorfors Play Set	1986	The background illustration features Sherlock Hemlock, the Amazing Mumford, Guy Smiley, Biff, Sully, and the Count in and around Big Bird's Nest. The characters included in the set are Big Bird, Oscar the Grouch, Ernie, Bert, Cookie Monster, Grover, Herry Monster, Prairie Dawn, Betty Lou, Little Bird, and Barkley.
	Ernie & Bert's Playhouse	1986
	The Sesame Street Ernie and Bert Set