I'm a writer who works from home. If you have good writing skills there are many different ways to make money.
Some other things I know people do:
Youtube videos. I was quite surprised by how much money you can make if your videos become popular! Search around to see some of the topics - I know people who do household organization tips, someone else who does video game reviews, but there are many, many more.
Making jewelry and selling it - I know two people who do this and while it is not making them rich they do get a profit.
Photography - again if you have the skills this can be done part-time. I know one who specializes in family portraits, another who does weddings, another who does pets.
Tutoring - if you have a teaching background or a degree in any area, you could do tutoring for kids who need extra help or to catch up. My friend who does this charges quite a bit per hour and her schedule is always full.
School lunches - I had two friends who set up a business making lunches for kids - the parents would order in advance and they would drop the packed lunch off at the school.
Goody Bags - two other friends made goody bags for parents to give out at birthday parties. They could do them for different budgets and ages. Because they were a business, they could get wholesale prices on a lot of cute toys and crafts and other items to go in the goody bags so they were quite unique and kids really liked them.
Farmer's Market sales - if you have a farmer's market in your town and you can cook, you might be able to set up a booth. I had one friend who set up a booth with a freezer and sold marinated chicken breasts, packed in vaccum sealed bags. You could choose from several different marinades. She'd also have cooked pieces for people to taste. Another friend bakes bread for the whole day before the market and then sells it.
Just some ideas - if I think of more I'll send them along.
TP