shelving request

We'd like to put up some shelving in the newly-painted study, to put knick-knacks and pictures on. It needs to be wall-mounted, able to match the other (dark wood) furniture we have in the room, and not look goofy in abundance. Those systems where you mount metal rails on the wall are right out. There's a chair rail on the wall, so anything floor-mounted is out.

Anybody have any pointers to anything that might fit the bill?