not really. they should get lighter in color but that's about it
You cannot change the color of your nipples
Changes in hormone levels during your pregnancy will change the appearance of your aureolas and nipples throughout pregnancy and afterwords as well. They can change in shape and color at anytime.
I know that your breasts will become sore and your nipples and the skin around them will change color.
Some foods become darker or lighter when they are cooked. Broccoli is one such food that gets lighter as it cooks.
If you spend to much time in the sun. Or you can just dye it a different color.
The nipples usually grow and become firm during Puberty. For boys they may get a little hair around them and the skin a little darker in color too.
Occurring between 18 to 20 days after mating it is the changing of color to the nipples which become pink in color in a pregnant bitch.
A lighter version of that color. For example, red will become pink, purple will become lavender, blue will become light blue