If you can make Halloween costumes you can make money selling direct to people by word of mouth as well as the was discussed above like at flee markets but you can also sell them to local stores that sell holiday decorations and costumes. Making costumes will probably be best for someone that has experience with sewing so it's clearly not for everyone. It's good for those that work with their hands. There are many idems that can be made for decorations that can be easily made for a low price.