Cut a square from blue paper for your ocean background and a wavy strip from yellow paper for the seafloor.
Cut out 3 green seagrass pieces, 3 colorful fish, and a starfish. Decorate each piece with marker details.
Glue the seagrass to the background, then layer the sandy bottom on top. Add the starfish wherever you like.
For the hanging fish, glue two fish shapes together with yarn in between. Repeat for all three fish.
Cut one long and two short pieces of yarn. Attach a fish to each one and glue the tops of the yarn to a popsicle stick.
Build a square frame using four popsicle sticks and glue the background scene to the back.
Add a loop of yarn at the top to hang it, then glue the fish-holding stick across the top front.
Let it dry and hang your new aquarium wind chime for all to admire!