Loony Pyramids (aka icehouse pyramids) are another attempt at this sort of thing. They're just nestable, stackable pyramids in three shapes and several colors,

Loony Pyramids (aka icehouse pyramids) are another attempt at this sort of thing. They're just nestable, stackable pyramids in three shapes and several colors, but people have invented or adapted a hundred or so games for them. They pair well with piecepack or playing cards.