Things that I would like to exist

Kee Klamp-like fittings for electrical conduit.
Escher-patterned carpet tiles.
Carpet punch for turning scrap carpet into carpet tiles.
Large-scale double-backed peel-and-stick adhesive film (dimensions of 24″ x 24″ and above) for affixing said carpet tiles. This probably exists, but I wasn’t able to find it.
Water jet cutter for under $1000.