What color are bantams eggs?

There are bantams of just about every breed. Bantams are not just a single breed, bantams describe the size of the bird. There are bantam Cochin which lay brown eggs. Bantam silkies that lay white eggs and Bantam Americana's that lay green eggs.

So the answer to your question is

They lay White, Brown, green, blue, rose, lavender and various other shades of eggs.