One idea is to incorporate a similar (or non-competing) color scheme that is apparent within the room (see Color Wheel). In this case, the hobby room takes on the color persona of the room where it exists.
A second option would be to highlight the craft space by means of a decorative divider, using color to designate where the existing room ends and the hobby area begins. In this case, a folding screen or shutters can be painted and serve as a focal point, representing the entrance to the hobby or craft space.