How to change Grid colors

IMO the current grid visibility is poor.
Is there a way to change the grid colors?

File / User Preferences / Themes, change the grid colour in the 3D View settings. Then save as default

Thanks! That was a quick fix!
It seems there is a usability bug, in large zooming into subdivisions, the color of the main lines and the subdivisions becomes the same! A different color setup for each one would be best.