If you mean the old-school cork flooring made up of glue-on squares, it's great stuff. I have it and love it to bits. I don't think more than a dozen people per year worldwide install it at this point :) I hope it comes back into fashion.

The newer multi-layer flooring is indistinguishable from plastic flooring. No point to it.

Hand-grips on trekking poles. Hmm, probably a bit niche, although pretty salient for me.