We all have something that we absolutely want to be real out of the Bionicle universe. Just think about it: masks of power people use for everyday tasks, an actual city of legends, transporting canisters you can hibernate in, a toa or a matoran, heck, how about a giant robot and a fail-safe system hidden beneath the Earth? What would you want as an element of real life? Post away!!!
Personally, I actually don't have a straight answer, but I lean towards masks.