Here are the cabinet color and the sink we will have (from design center)

These are my choices thus far... I'm worried about it looking too busy with the granite and I don't want it to be too dark since the cabinets are so dark.

The granite has a lot of life...I think your instinct about the mosaics might be right. I would opt for a single color pulled from the granite (preferably your favorite one).

Thank you! How would something more neutral like this work?

This is a picture of the kitchen with lighter cabinets (in the model home)

Where do you want the eye to travel? What's the star of the kitchen? I agree with dclostboy in that you should try to stay with a single color. I made this mistake in our last house - and now looking back at the realtor's pictures I can't help but go crosseyed when I look at shots of the kitchen. Whoa! What was I thinking?? Thank God somebody liked it and bought the house ~ Ha, ha..won't be making that mistake again. Less is more!

A beige / brown glass mosaic combo will look great