DH would love to have a coffee and music shop.
I've always wanted a bed and breakfast, but during my masters program I did a business plan for and and realized it's not in my cards.
I've also toyed with starting a birthday party business for kids -- planning around themes. When I had my daughter's Dora the Explorer party (complete with a Map event because "Swiper" stole the birthday presents, a homemade Dora-shaped cake, and sewn "Backpack" goodie bags with purple felt and the kids' names in gold glue), I had someone offer to pay me do do something for their kids, but I never followed up. I even had painted life-size pictures of the characters and hid them on walls throughout the house. First thing the kids needed to do was find all of the pictures and bring them into the dining room to decorate it for the party. It was a great time.
I'd also like to be a professional organizer (but I'd need to start at home!!).