The thick rope wrapped around the bases of the tree branches is a neat idea. When they get warn out from kitty claws, they could easily be replaced.
PVC Cat PlayhouseCat Heaven! A tiered cat structure, built from PVC and slings. - FORMUFIT.com
cat tree house diy
How To Make A Cardboard Cat House More
Katträd från Boråstapeter
Klösträd, Katträd & Klösmöbel | zooplus.se
This DIY wall planter is not only functional but makes for a great conversation piece, and has the appearance of a modern art installation.
Cat tree by LinaV. This is so badass I cant even. I want one in every room of my home right now.