This version (0.0.8) of the floor board generator adds options to add twists and hollow curvature to the individual planks. This is useful when creating floors in older houses and its more subtle simply rotation planks. All the options are now visually grouped as well to aid the user in locating related options.
An example (with a flat material to emphasize the subtle curvature) is shown below (click to enlarge):
The option values used to create the image are shown in the next image. Note that for illustrative purposes we made the gaps between the planks quite large: