Cat furniture is expensive, and it can also take up a lot of room. Who wouldn't love to give their cat(s) one of those huge climbing tree-scratching post-condo toys? Money and available space may make that prohibitive.
IKEA Hackers, a website devoted to the re-purposing of IKEA products.
Grace in Philadephia used black and red Lack shelves to make a series of "stepping stones" on her wall. She adhered non-skid shelf paper to the shelves, so the cat wouldn't slip jumping from one to the other. The cat can sit on the small shelves or use them as steps to climb up to the wider shelf above the door.
You can find complete instructions and another photo at IKEA Hackers.
Have you made your own cat furniture? Please share your space- and money-saving tips here at Crazy Kitty Chick.