I love to grow carrots in a rainbow of colors and sizes.
Even if you just like orange carrots, they come in different shapes and sizes:
Scarlet Nantes
Short and Sweet
Danvers – this orange carrot grows up to 7 inches long
Little Finger
Shin Kuroda – this one is good for heavy soil
Tonda di Parigi – this variety only grow up to 2 inches and is a French heirloom
Red Cored Chantenay
Imperator 58
If you want some other colors, then here are some choices:
Pusa Rudhira Red
Cosmic Purple – this variety is purple on the outside and orange inside
Yellow or Amarillo – this type is yellow on the outside and inside
Black Nebula
Lunar White
Rainbow
I usually get my carrot seeds from Botanical Interests and Baker Creek.