Many busy people these days don't have the time or talent to prepare meals at home, and they don't want to eat out too frequently either. Personal chefs are a perfect solution, and you might make some extra money by contracting with a handful of clients to deliver a certain number of meals each week -- or to prepare them in the clients' homes. You might cook for their dinner parties or family gatherings as well. Many personal chefs earn between $35 and $50 per hour.
Donating plasma can actually work out better than selling your blood.  It takes longer to donate plasma because they will put your red blood cells back in your system. The upside is that you can donate plasma as much as twice a week and you can make anywhere from $40-$60 per donation. You can make that $100 in less than a week if you can stomach the needle.
If you're running on fumes, financially speaking, but you have some money coming your way soon, consider pawning something of value to borrow fast cash. Of course, to get those items back you'll need to pay back the loan with interest. If you don't pay it back in time, that you'll lose the item. If it's really something that has a lot of intrinsic value to you, don't do it. But if it's something that doesn't, you can certainly consider it depending on your situation.
There are millions of children in this country, and many of them need babysitters from time to time. You might sit for neighbors' kids, or put up flyers or online notices advertising your services. How much might you earn? One national average figure is $16.75 per hour for one child. You can charge more for two or more kids, and you may also earn more if you're an experienced adult instead of a teenager, and especially if you know CPR or have some other applicable skills. Babysit for six hours per week earning, say, $20 an hour, and you're looking at $120 per week, or more than $6,000 per year.
Look into doing call center work, if that appeals to you. Some call-center jobs can be done from your home, making them extra convenient. These jobs don't tend to pay lavishly -- you may only earn $8 to $10 per hour to start -- but even that can be helpful. Work 12 hours per week earning $9 per hour, and that comes to more than $100 per week and more than $5,000 per year. If you have certain special skills, such as those that could let you be a tech support person, you may be able to earn more. Try Googling terms such as "call center jobs" and see what possibilities you find. Typically, you'll need a landline phone and Internet access, at a minimum -- a quiet room in which to work is also good.
 @dasjung It sounds like you paid a lot for your education, as did I. But you got to face it, today’s technology allows the average Joe to accomplish a comparable logo with much less effort than you or I could put into it, and the savings outweighs the extra benefit of our knowledge. We, as designers, have been out done. It is time to go back to school, unfortunately… 
If you have deep knowledge of one or more subjects, you can make money teaching online, such as at a site like Udemy.com. Some instructors there are making a lot of money, but many are just making a few thousand dollars a year -- or less. Still, even that can be very helpful. The money you'll make will depend on how many students take your course, which will depend, to some degree, on how in-demand a topic it is, and how well marketed it is. Note that once you do the work to create a course, you can most likely re-use much or all of it later.
If you have deep knowledge of one or more subjects, you can make money teaching online, such as at a site like Udemy.com. Some instructors there are making a lot of money, but many are just making a few thousand dollars a year -- or less. Still, even that can be very helpful. The money you'll make will depend on how many students take your course, which will depend, to some degree, on how in-demand a topic it is, and how well marketed it is. Note that once you do the work to create a course, you can most likely re-use much or all of it later.
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