The following types of eggs have the corresponding appearances:

EGG - APPEARANCE
Albino dragon - You can see the baby dragon curled up inside this translucent egg.
Autumn dragon - Markings match the bright colors of leaves falling from trees.
Balloon dragon - Light egg floating in the air.
Black dragon - Faint green glow around it.
Blue dinosaur - Brightly colored with white spots and lighter than the other eggs.
Blue dragon - Egg is slimy and blue.
Chicken - A third the size of the other eggs.
Dark Green dragon - Sits in a patch of grass and small flowers.
DayDream dragon - Egg sitting on a cloud.
Frilled dragon - This egg has strange markings on it.
Geode dragon - Heavy and feels as if made out of rock; obtained by breeding Stone Dragon with another Stone Dragon.
Gold dragon - Reflective and almost metallic looking.
Gray dragon - Surrounded by fog.
Green dinosaur - Brightly colored with white spots.
Green dragon - Sits in a pile of small pebbles.
Guardian dragon - Sits in front of the others.
Leetle tree - Leetle tree among the eggs.
Magi dragon - Has an orange aura radiating from it.
Mint dragon - Hidden behind the others.
Neglected dragon - Looks sickly and not cared for.
New Pink Sprites - Bright and pink.
Ochredrake dragon - This egg has strange markings on it.
Paper dragon - Made from of paper, small, and light.
Pink dragon - Bright pink.
Puddle dragon - Egg seems to be floating on a puddle.
Purple dragon - Purple.
Pygmy dragon - This egg is so tiny you almost cannot see it.
Red dinosaur - Brightly colored with white spots and warmer than the other eggs.
Red dragon - Warm.
Red/purple dorsal dragons - Has multiple bands of color on it.
Silver dragon - Gives off beautiful glow
Skywing dragon - This egg has strange markings on it.
Spring dragon - Markings match pink flowers and green buds.
Stone dragon - Heavy and rough, as if made out of rock.
Summer dragon - Markings depict the bright green of forest trees and yellow of the sun.
Sunrise dragon - Glows as brightly as the sun.
Sunset dragon - Glows as brightly as the sun.
Two headed dragon - Split down the middle into two colors.
Undead dragon - Kill a hatchling and revive it. There is a 50% success rate.
Valentine egg - Speckled and very fragile.
Vampire dragon - Seems cold and dead.
Vine dragon - This egg sits in a patch of grass and small flowers even though there is no sun in the cave.
Winter dragon - Markings have the appearance of icy snow.
Water dragon - Sits in a shallow puddle.
WhipTail dragons - Shakes from time to time, as if eager to hatch.
White dragon - Very clean look devoid of dirt and scratches.
White/red/green/blue striped dragon - Has brightly colored markings on it; must breed certain dragons with the white stripe to get blue, red and green stripe dragons.
Winter dragon - Markings have the appearance of icy snow.
Yellow dinosaur - Brightly colored with white spots and heavier than other eggs.