I found some coaster sized wooden discs at Michaels. After covering them with fabric, I added some felt number stickers. Today, Ella and I took turns telling each other addition stories using the discs and a bag of plastic sea animals.
We created a background by painting on bubblewrap and then using it to make a print on watercolor paper. While that dried, Ella made some fish using old paintings that we cut into fish shapes. I also found some sea life coloring sheets that she decided to paint. Later, she glued torn strips of sandpaper and some real shells on to create a sea floor and then glued on the fish and sea life.
Ella loved coloring on the sand paper to create a sand castle. We attached a flag with a toothpick and then added shells and other details after gluing the sand castle to blue paper. (This is how the project look before the shells and other collage materials were added.)