Several of the Carnival Glass clubs have had Fenton and other makers devise pieces (or sets) for sale at their conventions. There is quite a secondary market for these pieces. Here are several lists of them.
HOACGA souvenirs Bells for HOACGA, Fenton American Carnival Glass Association souvenirs International Carnival Glass Association souvenirs Woodsland World Wide souvenirs Holmes County Antique Festival Encore for Dorothy Taylor Texas Carnival Glass Club