I Spy also known as EYE Spy
This is so easy to make if you are looking for Pirate, Ocean, or even mermaid party or activity ideas.
I've seen these in stores but they are filled with plastic beads and then small objects inside you which you are supposed to find by shaking the bottle about.
This is very simple. You can use only small shells if that is all you have. Or you can find mini plastic animals and sea creatures for usually 5, 10 or, at most 25 cents to add to your shells. Make a label that lists all of the items that are in your jar or bottle. Then place the items inside. Fill the remainder of the jar with sand as shown here or rice, small beads, sugar, anything that is small enough for you to see the other objects around it. Use hot glue or super glue to glue the lid on tightly or you may end up with quite the mess on your hands.
To play simply have the children shake the jar around to see if they can spot all of the objects that you have listed. You can be as creative as you want with this. Have fun!