I am big into anything that encourages imaginary play, so pop up play tents and stuff like that are really nice. Ikea has a great selection of toys that are either fabric or wooden for a pretty good price to facilitate that. You can never go wrong with a box of printer paper and coloring stuff either. Our parents would always have that as one of the family staple gifts, and it was always a hit (6 kids 7 years apart). We also had pvc piping cut in different lengths with L and three way joints to make forts and other things. If your wife knows how to sew get some king and queen flat sheets at Goodwill and sew channels on the edges to feed the pvc threw to make your own custom forts. My grandma also got some beautiful dresses from Goodwill for our dressup box, so that is always a good place to look for interesting clothes. Things like this were way more memorable to us than any of the other toys our parents got us, and it's easy on the wallet as well.