Cat tree by LinaV. This is so badass I cant even. I want one in every room of my home right now.
For the play structure, probably not the wall
Cat Climber - Hooks over a door! I have this in my tiny apartment, my cats love it!
Make a DIY scratch board for your cat in minutes with just a few materials! #PetLifeHack
This is what the walls in Cat Heaven must look like! Covered in fabric mazes, easy to climb and easy to cling to.
DIY Cat Stuff... Homemade Cat Hammocks for under the kitchen chairs! :)
Awesome Cat Furniture Design Ideas For Crazy Cat People
Use a real tree as a stylish cat scratching and climbing post. | 27 Brilliant Hacks Every Cat Owner Needs To Know
DIY cactus scratching post