For the baby, I second the bibs idea. There are several free and easy bib patterns online, and you can never have enough bibs.
For the two year old, maybe a stuffed ball? I made my son one when he was two and he really liked it, and still plays with it (he's three now). It's soft, which is nice for playing in the house.
http://blog.burdafashion.com/bumo_en...patchwork-ball
It's english paper piecing, which is hand work. I usually avoid hand work, but it really goes pretty fast and you can do it in bits and pieces when you have time.
For the older boy? Beanbags sound like a good idea. I'm doing that for my 3 year old nephew this christmas. I'm going to package them in an empty coffee can so it can be storage and a toss-the-bag-in-the-can game in one.