Refinishing old furniture is a great way to make some extra money on the side. I go to swap meets all the time and buy old furniture to refinish and resell to make money.
The entrance barrier is really low and its a great way to build upon your creative side.
I've made some money doing this too. I can usually get a nice set of dressers or an antique chest for $100 or less and resell for 7 or 8 times what I paid. Old cedar chests are a good moneymaker.