Are you an artist, designer, illustrator or doodler? Are you working with a brand that has a strong visual identity? Do you simply have ideas for clever imagery or witty words? All you need is an image file with decent resolution, and you can easily make your creation available for purchase on the internet as a t-shirt, tote bag, mug, iPhone case or whatever else you can think of. CafePress is a great site that’ll handle the printing, processing and shipping on your behalf, but there are plenty of others that have good reputations too, including MySoti, Printfection and Zazzle.
Last but not least, you can also earn money online by building an online community, although the monetization strategies you can pursue will vary a lot depending on your goals. You can build a community with a blog, for example. You can also build an online forum and charge people for membership. You could even build up a Facebook group and use your influence there to sell and promote products.