In search for the most divers applications of crochet, and then preferably the non-obvious or completely pulled out of context variants, I came upon the work of Dana Barnes. This textile designer uses thick strands of unspun wool that are being braided, knotted, crocheted and felted into large textile art pieces for the interior. Inspired by nature and the outdoors, her work represents crop field, hills, knotty oak trees and even a felted tractor tire.
One of my personal favorites are the crocheted squares named: Looped. These huge granny squares of 3 feet by 3 feet take almost 2 days to make. After crocheting the squares with the thick strands of unspun wool, they go in the washing machine for a few hours in hot water to felt them. Then they are hand-moulded and laid to dry on the roof of Dana Barnes's loft. The squares can be used seperate, but (hand)sewn together they form a large thick carpet.
Besides Looped I'm also a big fan of the Twisted rugs. These rugs are made by braiding the unspun wool and then sewing the strands together in circles and other organic forms. The whole rug is then felted. Because the braids vary in thickness you get very nice height differences in the rugs.
It would be great to ever work on a scale like this.