A couple weeks ago I added oatmeal. Actually, the first time I used oatmeal I was making dinner and Adalyn just wasn't happy. I poured some out in a couple containers and let her have at it. She was super entertained.
Yes, it gets messy. But I am okay with the mess if it gives me a happy kid. Towards the end of her play she started to move the oatmeal to the living room. That was where I drew the line and cleaned it all up.
Other things I've added to the table (you can use containers or bins, too):
- lentils (small enough so they aren't a choking hazard for the little ones)
- shaving cream