Join Date: Jul 2014
Location: Pennsylvania, USA
Look at Ikea Hacks to get some ideas.
There's a pretty awesome outdoor cat run, down to something as simple as a sling under a table or cutting out parts of bookcase shelves and gluing down carpet in order to make a simple kitty condo.
Right now I'm planning on enlisting my dad's help to make some homemade CatWALLks. It should just require some lumber, carpet, glue, a staple gun, a drill, a stud finder, screws, and some brackets.