Yes, even the PowerPoint presentation requires outside consulting every now and then—especially if it's not your forte. I know I would happily outsource the visual layout of my presentation decks for work meetings, investor pitches and lectures. Tobias Schelle of 24Slides is living proof that you can turn your skills at slideshow presentation design into a legit side business idea—and potentially earn up to $20 a slide for your time and talents.
I created an “Every Day I’m Hustling” shirt and sold enough for the campaign to ship, but didn’t earn much on the experiment because of some not-very-effective Facebook advertising. Still, some opportunity here and a friend of mine is doing REALLY well with this. If you can create awesome designs and reach the right people with good Facebook targeting, Teespring can be very profitable.