A shrimp tank with dark substrate a few peices of bogwood, some anubis and lots of moss would look good. You can even try and make a moss wall. I had one in my first shrimp tank and although it was challenging, it looked brilliant. I would say start with red cherries, but if you do not want to get overrun, you could always start with something a little harder to breed. If you do pick anything like CRS, then watch the water quality does not deteriorate in a small tank. You may find that the contrast of the brightly coloured shrimp against the natual greens of a moss wall can be very relaxing. Just my thoughts, but I appreciate that its not for everyone.