Have you ever considered offering holiday window art do make more money during the slow season?
What if you got a slide projector and projected an image on a window and then traced the image and filled it in with paint? I bet that could be pretty easy to do if you did it in the evening. Maybe you could also have some pre-made stencils you could hold up to the window to trace the outlines and then fill in with paint.
I bet there are many businesses and home owners in your area who would like to spruce up their windows with holiday messages.