All great ideas! Not sure if you left multi-level marketing off on purpose, but I’ve recently started taking a nutritional supplement called Thrive, and due to the amazing results (tons of energy, great sleep, calming of aches and pains, etc.) I’ve started working as a promoter. There is absolutely no requirement to pay anything to sign up, you don’t even have to stock the product, it is a cloud-based business where the customers order online and receive the product directly from the company. If you get two people to sign up with autoship, you get your product free. Even if you pay for the product it is only about $5 a day, less than a cup of coffee in the U.S. So far I’ve been really impressed.
Obviously some of these small business ideas have more earning potential than others, but what they all share in common are relatively low barriers to entry and the flexibility to work at them for a limited amount of time per week. I also tried to focus on side business ideas that have some sort of online component to them, since that's what I love most.
Market your talents to building contractors. People purchasing new homes can often be overwhelmed with the choices and possibilities in home decorating. Design some questionnaires for each major element and each major room in the house. Find out how the homeowner will use the home--are there children? Pets? Does the woman of the house wear high heels? Do the home's residents neglect to remove shoes? How will each room be used? Where might task lighting and ambient lighting be most appropriate?