I always feed my boys a treat of cilantro or parsley during floor time. When I put them in the kitchen they are alert and trying to get to the food.
I went to Lowe's and found 9 foot sections of large pvc pipe with small little holes spaced down the length. The person at Lowe's cut it for me for free into 3 foot sections. I put them in different parts of the kitchen and my boys love to walk and run thru them. All you hear is the little click, clack of their nails going thru it. Sometimes there will be 3 in a little piggy line walking thru it at one time.
At WalMart I also found cute little pop up tents that are made for cats. They were cheap between $4-$6 for each. They have cut out circles on the sides of them. I have a tent shaped one and 2 box shaped ones which attach together. They have so much fun jumping thru them and playing chase thru them. It's made of a really thin vinyl so when they pee in it I just rinse it and it's clean again. Good luck!