I have been doing Montessori activities on trays with the girls for a month or so. Here is a sample of one of the activities Kid #2 has been working on.
It requires 2 small bowls, a kitchen spoon and rice.
She "played"with this for about 30 minutes and clean up was a breeze since all the rice (well, most of it) stayed on the tray.
I am currently working on a rotation for both girls involving tray activities. I have been looking for more trays at yard sales, so I can get the budget for this low.