Here is my class follow-along octopus. I tinted mine a dark green and then played with the gradients. My biggest learnings came with trying to get the contrast right.
Here is an image from Vintage Printable, which I love. I thought it would be fun to use this one. I placed it on a paper texture and liked how the gradient gave the hair, face and clothes different, slightly realistic colouring and a stubble-like shading to his chin. I also like how the head looks a bit removed from the body due to the white collar.
I don't yet have any ideas on specific projects for the future, rather I'm collecting ways of doing things, so I can pull a technique out of the bag if it fits.