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Use coffee grounds instead of dirt. Make fizzing dough. Shape the eggs using plastic eggs. Make frozen dinosaur eggs.
Coffee grounds can provide a nice texture for your dough, and are more sanitary than dirt. Simply follow a recipe for dinosaur egg dough, but replace some or all of the dirt with coffee grounds. You can add a fun fizzy factor by using 1 cup of baking soda (instead of 1 cup of salt) in your dinosaur egg dough. As you crack open the dried eggs, set them in a dish of vinegar (or citric acid). The baking soda will react with the vinegar, causing fizzing and foaming. You can create dinosaur eggs by filling plastic Easter eggs with whatever dough mixture you are using. Once the plastic egg is full, close it to squeeze out excess dough. Open it again, and remove the dough egg. Let the eggs dry thoroughly, and crack them open. While these eggs will be relatively small, they will have a uniform appearance. Take a small plastic dinosaur and place it inside an empty balloon. Fill the balloon with water using a faucet or funnel, then tie it closed. Place it in the freezer. Once it is fully frozen, cut the balloon away to reveal a frozen dinosaur egg! Have fun melting the eggs to "hatch" the dinosaurs inside.