Here is a picture of the shower that I want to retile. Also add a new door.

Can you add a larger shot of your bathroom to provide context? It would help to see the vanity from afar as well as how it ties in with the shower.

I really like the counter and the wall color. At this point in time I would probably not use the mosaic, just the silstone color for the shower walls. It might be tricky trying to make a glass mosaic fit with the subdued silstone.

I will post an other image shortly.
I am not sure if it looked to dark if I used all Silestone. The bathroom is on the darker side as it only has one window.

I agree with you on the mosaic. On the one hand it would give it a contrast, on the other hand the new theme is somewhat subdued. It might only work with a "non-shiny" mosaic.

Here is a better overview.

And the left to the shower.

The color of the countertop: http://www.paletteapp.com/Products/Silestone/GREY_AMAZON/15865

Wall color:
http://www.glidden.com/mobile/room-painter.do?colorChipId=65&colorName=Soft%20Meadow&textColor=black&rgb=210,213,199

Boy, I am thinking that the white already there is the best in this situation. Is it in good shape? I think I'd leave it because it ties in with the tub surround and the floor. Did you say you were getting a new door? That in itself might be the update you need. If you need new tile I think I would try to match it with the tub surround as close as you are able. Others may have very nice alternative ideas.

The tiles are in good shape. The tiles are an off white/cream. Just got a bit tired of them. Also, I might need to open the wall a bit for a valve repair. Technically, I could get access through the drywall from another room.

Yes, I would like to replace the door.

I thought about retiling around the bathtub as well. But then the projects seems to grow more and more.

Don't know if there would be a combination of leaving some of the tile in the shower and add some new ones.