I just went on to work on my rated Tactical puzzles site and just did not like the look and feel of the grey background. It just makes it look so depressing and hard to stay focused on the greyness of the site. Maybe, you can make a special option selection, so one can either have the white and blue squares of the grey color option. Grey is not very encouraging to work on.
I hope you will find a workable solution, with a color selection option for board colors.
Thank you, Henry.