If you have handyman skills, a service like TaskRabbit is one of the most lucrative ways to earn money. People are always searching for others to help them complete complicated tasks, like furniture assembly, roof patching and painting. The most experienced workers with the best reviews can often charge up to $80 an hour. Personal shopping and food-delivery during office lunch hours can also be lucrative, particularly if you can snag large orders (with appropriately large tips.)