Magnetic number fishing, they add what they catch! As well as addition, develops hand/eye coordination, fine motor--I love this for magnetic letter fishing too! When they catch a letter, they say its name and sound.
Cardboard and thread insects. circles and ovals of corrugated cardboard with slits cut in the circumference, cross-wound with colored threads, chenille stem bits for antennae, acetate wings decorated with permanent markers
Bottle bottom turtles - too cute! Just need a turtle shape and the bottom of a bottle! (for a big turtle) or you can use smaller bottles for smaller turtles. Make it fun and let the kids decorate their turtles with glitter and stickers too!