Home-made Cat Toy; a plastic bottle with a couple holes cut in it, then filled with cat treats and catnip. The more cats bat it around the more likely a treat will fall out for them to eat.
DIY cardboard cat houses
Tuna Catnip Kitty Treats!! Hank and Edith don't know what's comin' at 'em...
yes. cats would love it. a peak to survey their kingdom and attack from.
DIY pet brush - let your cats scratch themselves while this diy toy brushes off their extra fur
Cut out squares in a bookshelf to create a kitty exercise tower. | 26 Hacks That Will Make Any Cat Owner's Life Easier
Great idea 2
This sofa saver. -- OMG, I need to make these!!! Luckily I know how to sew, and I have some heavy-duty canvas that will serve as a good base.
Home for cats
Cat Powered Auto Feeder. I am so doing this for my crazy kitten who loves food, loves to play -- and does not get enough of either in his opinion.