You are probably in a basement, right? I would paint it an almost white teal. Use bead board for the fronts and sides of the bar itself & paint them white. I would install a porcelain subway tile clear across the back wall & anywhere you may have liquids. Where you end is up to you. Subway tile is one of the least costly tiles. Maybe use a soft teal color for the tiles & grout with white grout. Go up as high as say thirty inches in a running bond pattern and attach kitchen type chrome shelves above the tiles for your liquor & glasses. Change out your bar area light for LED lights on a dimmer for ambiance. Add a large rug under the pool table to protect the floor when balls get away from you. It could be a snazzy zig zag black & white one or the striped black & white.

Also pick out some great colorful posters from art.com in a drinking vibe to line the walls.