I have a cheap graphics tablet from Lidl and am experimenting with the Gimp, learning the different things you can do. I don’t think it will replace doing art by hand, as my scratchy pen-and-ink style would be very arduous to replicate on a graphics tablet, and I’ll have to watch out for the slightly plastic look that can easily afflict computer-made art. But pen and ink does not allow me to draw over black with white, and creating a trail of sparkly lights is fiddly and arduous with ink and paper but takes only seconds on the computer.
The stars in the background come from the NASA website, images from some space telescope. I did not note where, though, so cannot give proper citation. Sorry, NASA.
 Technical details: Gimp’s “spark” brush with random dynamics. The standard “dynamics random” preset includes random opacity, which I didn’t want for this, so I created a custom dynamics option with random size and angle. (As “spark” is perfectly circular the random angle bit is superfluous but I can use it for other stuff too.)