A recent favorite with the kids has been Look & Find books, where they have to find the items shown in the key in the larger picture. We had one that they'd gotten for their birthday that we'd pretty much worn out, & then I bought them each one for Christmas.
They'll sit, or preferably lay on their tummies, forever looking for all of the listed items. Of course, it's even more fun if Mommy or Daddy looks with them.
It's so cute to see the joy on their faces when they find an item they've been searching hard to locate. What big kids they're getting to be!