Germs can be many different colors actually. It just depends on what kind of germ (or species of bacteria you could say) it is and what sort of media (bacteria food) they are growing on. Most of the time, bacteria are tan or white. However some bacteria, like Staphylococcus aureus, are bright gold! Also, when bacteria eat certain things in the food they grow on they can change colors. Some things turn bacteria blue or even red!

Blue Bacteria!
Hope that helped to answer your question!

Germs (bacteria) can be all kinds of colors, but many are typically a light green or yellow color. However, scientists who study bacterial cells will often stain them with a technique called "Gram staining." Bacteria that are gram-positive have a thick layer of "peptidoglycans" on their cell membranes and retain the stain, making them violet. Bacteria that are gram-negative cannot retain the stain, and they look pink instead.

For me, germs are so small I can't even see them. If I try to look at them under a microscope, I have to use a very high magnification. Even then, they are clear and hard to see. Sometimes we will stain them to see them better. The stain is specific for part of the germ so that we know we have found the right germ.