My late grandmother did plenty of aspic dishes and the like during the '50s through the '70s, as evident in family photographs during holiday/get-together meals from the period. Per my dad, aunts and uncles however most of those recipes could stay in the past, like savory ones or the tuna-broccoli-and-lime-Jello aspic. That said, her orange creme Jello salad is still a Thanksgiving tradition, as it’s pretty good.
Most of these aspic recipes came about during wartime rationing as a way to stretch out your meat and vegetables, and I understand were fairly common, especially in the UK (or so I’m told) since meat rationing lasted into the 1950s.