DD I can't remember.....

DS used to love wooden blocks - stack and knock over (cause and effect)
socks in the washing basket - in and out, throw in, roll around the floor
the tupperware cupboard - he used to be able to climb in, but hey, it's only plastic and it stopped him trying to get in other cupboards. He'd stack containers, play with lids, dump it all out and put it back. Oh he especially loved my old old tupperware stacking measuring cups.
a mixing bowl and wooden spoon - to 'mix' or bash
me singing to him - especially songs that required clapping/arm movements or animal sounds
a container of water and a few cups outside - we have a sand and water table he could pull himself up to. I'd use either water or sand or flour or rice for some different texture.
rolling different sized balls around - either to him or letting him just chase them around
musical instruments
the sandpit

I guess because I had an older child to entertain but he got to do stuff at that age that I would never have thought of for DD, like drawing with crayons, finger painting and playdough (all supervised of course). He still loves to do all those things.