If you are on the lookout for a way to earn extra money doing something creative and enjoyable then print-on-demand with dropshipping is a good option. 

There is an Aussie site that offers this called The Print Bar

For free, they give you all the tools you need to create your own products like t-shirts, notebooks, mugs etc. Basically you come up with the design and upload it into one of their very easy to use templates. Then you publish it on your own subdomain, which they also give you for free.

They do all the order processing, mailing of the products, etc. You set the price for the products that includes their payment and yours. 

There's another more advanced option. And that's to use a bigger site like Printify. This integrates with various ecommerce channels such as Shopify. So it's ideal for those who already have a site with one of these channels. Many businesses all over the world use it to create branded products so if you're in that category already please check them out

Obviously if you have experience as a designer you'll be in your element with these sites. But you don't have to have any formal training, or even special skills, to create products that people like and buy.

You don't even have to have anything visual. You can just come up with funny or interesting lines to put on products. This has great potential if you're a bit of a wordsmith.

Being new to this process myself, I have a lot to learn -- particularly when it comes to the aesthetic aspects of designing, as well as which categories of products sell better than others, etc. So as I try out different approaches and find out which work best I will post thoughts about them on my blog