Circles, Triangles, and Squares, by Tana Hoban, is a wordless book featuring Hoban's photographs. The photographs were of all different things, taken around the community. The kids loved finding all the shapes in each picture, and it was interesting for me to see what they noticed.
When someone found the shape on their card, they raised their hand and got to take a picture of it. I had never tried this lesson before, and was a little worried kids might get bored waiting for their turn with the camera, but it went really well. They were super excited and doing a great job making observations. After they took a picture with the real camera, they used "imaginary cameras" to take pictures of the other shapes they saw.
Here are some of the pictures they took. We are going to turn them into a class book. (I made them black and white to match the Hoban book. Also so I can print them for free at school, ha!)
I think the Tana Hoban book may be out of print, but she has lots of other great, similar books you should check out! The kids will love them!