I like how the anime and some spinoffs like pokemon channel give certain species unique eggs. In the main games it's just manaphy, not even phione gets it. I know it'll never happen and it'd wreck randomized egg runs since you'd immediately know what's inside but I'd love to see more variation in shape and color to fit. Maybe to preserve egg runs add a gift wrap/egg warmer item that can be used on eggs that gives it a generic texture?