Image Vintage from Google Images
The first remains of decorated egg were found in the Carpathian basin, in Hungary in an Avar grave, which is about 1500 years old. The pattern was etched on the coloured egg. This is the oldest form of decorating eggs. When you have dyed the eggs, take a tapering knife and etch the pattern on the surface of the eggshell.
The other widespread technique of decorating eggs is batik. In this case you paint the pattern on the eggs in hot wax then dip the eggs in the dye. This egg decorating technique is well-known from the Carpathian basin as far as the Urals. The Scythian people, who lived in these territories, were famous for keeping bees for their honey. The spin-off of it was wax, which was also used for many purposes. One of them was preserving eggs for a longer time. If you cover eggs with wax, you fill in the pores of the eggshell and it won’t get oxygen, so it prevents the egg from decomposition.
image from Ibolya's Hub Page.
Sun: it is the symbol of Jesus: Sol Invictus. It is the Sun after the spring equinox, when it defeats the darkness.
Star: When it is alone, it always refers to Venus, which is related to Jesus and his mother Mary.
Rose: Flowers usually symbolize love but a rose may also refer to Mary if it is white.
Lily of the valley: it symbolizes goodness and virginity. It is also the symbolic flower of Mary.
Pine tree: it is the tree of life since it is always green.
Heart: it is the symbol of love.
Oak tree: it has been respected as a saint tree since the ancient times. Later on it became the symbol of Jesus and his mother Mary.