Your eggs will be high on grass...
Create a unique centerpiece for your eggs using Spring decorative items and a layer of grass! Yes - real grass! All you need is a large platter or flat basket. Place a layer of soil in the bottom of the platter or basket about 1" deep. (The basket may require that you line it first with plastic.) Sprinkle the soil generously with rye grass seeds or any type of fast growing seed. Sprintz the seeds with water, and lightly tamp the soil. Cover with plastic wrap for germination. In a few days, you will see the grass sprouts. Do not remove the plstic wrap until that time. Once the seeds have sprouted, you can remove plastic wrap and place in a sunny spot. Spritz daily with water after the plastic has been removed to keep the soil from drying out. The grass seeds will require about 7-10 days to reach full height, so if you plan on using this idea for a centerpiece, plan early. Also, I like to plant an egg carton or other disposable container with extra seeds as back-up, which can be transplanted into your centerpiece container if the first batch does not work out. Add a paper mache bunny, your eggs and some spring flowers. Make a sign with "dot writing" that says "Eggs for Sale", etc.
Next, place a balloon over the squeeze cap, turn bottle upside down and squeeze about 1/2 cup of plaster into the balloon. Pinch the tip of the balloon and pull away from the bottle. Keeping the mouthpiece of the balloon pinched, swish the tip of the balloon in water to remove excess residue of plaster. Quickly submerse uncapped squeeze bottle into water to prevent plaster from hardening.
Inflate the balloon by blowing air into the mouthpiece. Plaster is not toxic, but tastes bad, so rinse mouth if necessary. Tie off the balloon and roll from hand to hand to entirely coat inside. Continue turning gently until you can feel a heavy side developing. Float the balloon in a bowl or sink of water to prevent a flat side. Do not disturb the floating balloon eggs for at least 15 minutes.
Once the plaster is set, cut the tip of the tied balloon and peel balloon away. Shave or sand the "navel" or "tied-off" point. Let egg dry or cure for several hours more, then paint if desired. Use a light color wash and flecks of brown, etc, achieved with a toothbrush for an authentic look.
Some important tips: The ratio of plaster to water is important to achieve the right hardening effect. DO NOT add water to powder, add powder to water. It is important to pinch the mouthpiece closed prior to removing the balloon from the bottle to prevent the plaster from spilling out. As plaster hardens, it will release a gentle warmth. Do not be alarmed. Make sure the egg cools prior to unwrapping it. If you remove the egg from the balloon or the plaster/water ratio is wrong, it will not set up correctly and will most likely crumble. DO NOT pour plaster/water mixture down your drain as it could block pipes. Dispose outside - its good for the soil.