These ideas take very little capital and also provide a regular income stream to supplement your retirement:
Concierge - Do you like shopping? Why not run errands for your friends and neighbors while using their money. You can also make their travel plans, organize bills, and dog sit. There really isn't a limit to what you can do.
Someone's Trash is Your Treasure - If you don't rummaging through someone else's trash or dumpster diving, you can earn dollars selling discarded usable items on ebay and craigslist. After awhile you will learn what will sell and what won't.
Pet Transportation - Do you love animals and possibly have a van? Perfect! You can take pets to their vet and grooming appointments while earning some side cash.
House Sitter – When the owners are out of town, make their home your home. Water plants, check the mail, receive the paper, put out the trash and turn on the lights. It doesn't get much better than this.
There are so many ideas, the sky is the limit. Turn those hobbies and things that you love into cash!