I don’t remember how I found this blogspot but it had an interesting interview with the twin authors of The Siblings’ Busy Book that I just ordered for my daughter. It has at-home activities that keep the interest of brothers and sisters of different ages while they are creating something together.
Found lots of similar books by reading the various reviews in Amazon. Actually, the day care centers would probably enjoy the ideas in these books as much as the parents do! – Here are some of them – Be sure to check out the similar books at the bottom of the book descriptions:
more Art oriented books
Arts and Crafts type books
Busy Books for various ages