Only thing I have ever heard of is the Hungarian Rainbow Wax peppers too. Did they give you any more other than blocky of a description.
The only heirloom bell I can think of is and I may have the spelling wrong is Pustzagold. It makes a beautiful what I would call a rainbow bell. It starts out a pale yellow and then turns to what I call a tangerine-orangeish color and has those three colors all at once and then turns to a deep orange and red.
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