Plastic Capsules
One type of fun water toy comes in a plastic capsule, similar to a pill. When you put it in water, the plastic capsule begins to dissolve, and what is within the plastic capsule begins to break out. Often times what comes out is a sponge toy. The sponge may be in the shape of a certain object, such as a fish, dinosaur or bird. You may find these toys under the name Magic Grow and Magic Capsules.
Growing Figures
Some figure toys made out of a foam material will expand over time when soaked under water. Some figures that start out measuring 1 inch long may expand to 5 inches wide or longer. Once the figure is taken out of water, it slowly shrinks back to its original size. There are many figures to select, including cakes, reptiles and other animals. You can find these toys under names such as Growing Dinosaurs or Grow-an-Insect.
Gel Balls
Orbeez are gel balls that start off as hard small pellets and grow 100 times their volume after soaking in water. They turn into round uniform balls that are soft, squishy and bouncy. There are a variety of colors that come with the kit. Some kits include a tray shaped into a certain object, such as a butterfly, where you can fill the tray with different colored balls to create display art. Orbeez may continue to be regrown and reused after it has dried.
Hatch-and-Grow Eggs
Some plastic toy eggs will transform in water. As you soak the egg in water for 48 hours, you can begin to see the egg start to hatch. A baby dinosaur and turtle are among the animals you can see hatch out of the egg. At full growth, the baby animal figure can measure as long as 5 inches. You can find these toys under Hatchin Grow and Growing Dinosaur Egg.