If they are not dirty,and don't SMELL
I have had very good luck with throws wrapped around the cushions (there is always a throw for someone to wrap around their legs). They can make things look good every time you go to the boat. Now, if you are sleeping there, I have space age foam, that stuff that keeps your foam dry, and clean sheets every time I go to the boat. Are you looking for a new look or a place to sleep? As Fred would say "We need more info".