Since we're planning on using our Beaver for the next 4-5 years and don't expect to get all that much back for it at that point, we have continued to redecorate it to suit our tastes without any particular concern for resale value. Our current project was to replace the tired, old green front windshield curtains with something a bit more "interesting". The attached photo shows the new lace curtains which replaced the green ones. We don't camp in places where we are concerned about the loss of insulation and we have an external sunshade for privacy purposes if we need it. We were able to reuse all the hanging hardware and our electric "track" still works fine.
It's not for everyone, but for us it's great and matches the lace curtains that we made to replace the original blinds!