I have a collection of plastic lids such as off sprays - use the ones from cooking spray and hubby's shave cream not the cleaning supplies. Empty plastic jars - put a toy in one and close and let them roll them - use them instead of balls for bowling. We have a collection of large yogurt tubs and lids - the lids fit into a large cereal box and teh tubs stack. We put the lids on and they build walls with them and then roll the jars at them.

Have several exercise balls we roll around and I give them "bouncy rides" on.

I have a lot of homemade toys too such as fabric scraps for sorting.