There’s an excellent chance that you have one or several musical instruments sitting in storage that haven’t been used in years. Perhaps it’s a leftover from when you were in school, or even from your days playing in a band. Whatever the reason that you have it, it’s probably worth money if you can sell it. Brand-new instruments are ridiculously expensive, so people often look to buy used equipment instead, particularly if they are novices.
Many big businesses are looking for social media influencers to become long-term ambassadors for their brand. This would involve you working closely with one particular band, and promoting their clothes, products, and services. You may also be restricted from promoting other brands, so check out the small print before agreeing to any long-term agreements.
Check if you need a model release. Photos of people can only be sold for commercial use if they've signed a 'model release' that gives you permission to use their image (children need a parent/guardian to sign). Without a release, these photos can still be sold for editorial use, as long as they were taken in a public place – eg, if you submitted a 'breaking news' shot with people in the background. If there's any doubt, always ask permission.
Amazon describes its Mechanical Turk service as a “marketplace for work.” When you sign up as a worker, you can then choose which tasks to complete. Those tasks might involve translating text from one language into another, rating search results, determining if a website is suitable for an audience, correcting spelling, or pulling usable information from images. In general, the tasks don’t pay much, but they also don’t usually take much time. It’s an interesting system, though it may be challenging to make a substantial amount of money from it.