It's a great idea to make some soft but heavy bookends for a kid's room. Maria's books can always use some support. It doesn't look like these would be too hard to make at home---just need fabric scraps and sand.
This blog is in Italian, but the pictures for this great tutorial are easy to follow. These little stuffed owls are so cute! I think they would make the cutest little pin cushions or even book ends if you add some weight when stuffing these cuties! The possibilities are endless with thousands of fabrics to choose from at the Fabric Shack at http://www.fabricshack.com/cgi-bin/Store/store.cgi