Via Cathie. Some of them are cheating (for example, three of them are each 1/3 of a commercial Memory game) but surely you'll find some good ideas there.
Don't skip to the list itself without reading the suggestion for how to deploy these activities (the "school box"). It sounds like a great way to begin training a preschooler to do "independent work" while Mom is busy with other kids — always important for homeschoolers, but especially in a larger family.