3D - Caustic Collection

I feel interesting with Vray caustic lately and try to make a nice simple collection of caustic shapes. For detect more clearly each object (all of them are build-in object in 3ds max), I've make a clay render in bottom.

Which caustic(s) do you like? IMO, I like 1,2,4,5 (order left to right, top to bottom).

Thanks 4 viewing (:

_{Should view in fullsize 2400x2400 to see caustic details. Available for download.}