Jayne, the proprietor of the Etsy shop likekittysville sells cat accessories like beds you can hang on a wall. She also was kind enough to post the instructions for making the marvelous climbable Christmas tree she designed a few years ago that will bring your cats joy for many holidays to come. Jayne talked about how the idea came about:
“For years I’ve missed using my vintage aluminum Christmas tree, but don’t miss the kitty havoc that was decimating the tree and its vintage ornaments. I wanted a tree that’s not just cat-proof but cat-inviting. This tree has a Jetsons space-age look but is quite practical. It can be climbed but not knocked over. It can hold gifts, which saves floor space. The ornaments are cheap and easily replaced.”
It's six feet tall, and folds flat for storage until next Christmas. -via a comment at Fark