The first set of twelve ironstone mugs were released in 1978 and 1979. Each mug had a drawing of the character on each side, with a Muppet Show logo and the character's name in between. Kiln Craft also released a Christmas mug in 1979 featuring Kermit the Frog and Miss Piggy.
In 1980, Kiln Craft offered a set of 6 mugs that featured one picture spread around the mug with a saying, or one-liner joke. These mugs featured Kermit the Frog, Sweetums, Gonzo, Miss Piggy, Annie Sue, Statler and Waldorf, and Animal. The same year they also produced a special production gift mug given to the studio staff and crew at ATV Studios, where The Muppet Show was filmed.
In 1981, Kiln Craft produced 3 "comic strip" mugs and a set of 6 "Kids Cups". The mugs featured Kermit the Frog, Fozzie, Statler and Waldorf, and Gonzo, and the comic strips were drawn by Bruce McNally. The Kids Cups were smaller than typical coffee mugs, and were sold with an Easter egg and sweets inside as an Easter promotion.