If using brown eggs, blow them out. You may use white eggs and dip them in steeped tea to turn them brown. You may also use wooden eggs for this project.
Take the toothpick and dip it in the craft glue then dot it onto the leaves or flowers you have chosen, then apply the leaf or flower to the egg glue side down and allow to dry completely.
When eggs are completely dry, completely cover with a coat of spray varnish or decoupage medium to preserve your creations.