This is a Trello theme where you can choose your own colors for the board background color and of the list title color, using a color picker BEFORE installing it. See screenshots for examples.

It may be best to choose a background color that is not too bright, otherwise the white text (board name and icons) will be unreadable.

Based on http://freestyler.ws/style/75394/trello-theme-gray, so contains additional styles (black top bar, uppercase list headers, lighter color for lists etc).

If you ONLY want to change the board (page) background color to a custom color, without additional styles, try out my other style http://freestyler.ws/style/127199/trello-custom-board-color

This theme, like all user styles with custom colors, will not automatically update.