Favorite egg? Hmm... that depends:

• Quail eggs for eating. They are sold by 16, but they are so small I usually eat all 16 for one meal.
• The most interesting eggs are the ones that lived to their potential, that is, hatched ones (in form of small animals). Some eggs are transparent, so they are interesting already as eggs (octopus eggs would be my favorite in this category - did you see those tiny tentacles? soo adorable :o) ).
• When it comes to colors my favorite are minerals cut in the shape of eggs - got close to 100 of these :oP