I am pretty sure I have posted about this one before, but this remains one of my all time favorite sensory play activities (and Soren's). I snagged this one from a friend, and it's been golden in our household since.
Simply grab a few kitchen bowls, measuring cups, baster, fine colander, whatever you can find - bubbles and warm water. I like using the daily kitchen tools because they are easy to clean up and it familiarizes Soren with what we use to cook food.
This is a great activity when you have to prep for dinner. Soren will go at these bubbles for t least and hour and have a blast. This time he brought his cars over - 'they need a car wash' I was told. I was able to make Cranberry Sauce, Salmon, Green Bean Casserole and start Banana Muffins. I say start - because at that point the little man always joins in!
I put a towel underneath of him but almost always, ALWAYS have to mop the floor afterward. Which isn't such a nuisance since we typically mop after cooking anyway!