For a wedding? Or just for personal space? Inside and/or outside?
A toy barn or a real barn?
Here's a link with some ideas:
Depends on what the purpose of the decorating is for. Just to use as additional space for your home? Decorating for a special event, or a special purpose. We need more information.
Ingrid....String lights and hay bales for seating. Then follow your event...Wedding colors, school colors, birthday ideas...whatever the event! Have fun and enjoy!