Anonymous wrote:OP here. Thanks for the suggestions! I like the idea of a sincere note and a homemade (or homemade-ish) dinner. You're all probably right that simple is better. The photo idea is nice too, except that my mother-in-law is a very good amateur photographer and enjoys taking photos of the kids and printing out her favorites. Not only do they already have tons of photos in their house, but most of the photos we (and my parents) have are also from her. But maybe something like a photo mug, or travel mug, or calendar? Like one of these things:
http://www.shutterfly.com/photo-gifts. Has anyone gotten anything particularly nice along those lines?