Though certainly not for everyone, recycling the containers from products left strewn around on the ground can become a surprisingly decent side business idea if you put in the time. Attending events like street fairs and outdoor concerts can be a great starting place. Put on a clean shirt, jeans, apply your sunscreen, grab a cheap pick-up tool like this one, sturdy plastic bags, and you can sell them for upwards of $4.00/pound on eBay.
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?