But, you don't have to buy new stuff to do something really cool.
I found a website somehow called How To Make Art. The artist behind the site, Tessa McSorley, has some great art and great ideas that won't cost you any money.
One idea I'm trying is the repurposed book. You take an old book no one is using anymore, like the below:
Then, you start working in the pages. It can just be a practice sketchbook or maybe you make it into a work of art. I have begun but so far, it is really rough. Below are a couple of pages I added random color to -- we'll see how it turns out later today.