I have made a few artwork pictures in the past about Bitcoin and I found them on my old hard-drive that I was just about to sell to a friend tomorrow, so I was thinking about posting them here, free to use, since I don't believe in copyright, although I put some work in making them, I have also used Pixabay's database for sources. So even though I have put work in making/editing these pictures I did it so that it can be used on Steemit or for the larger Bitcoin community as a whole.
So enjoy using these pictures for anything you want, they are all very high quality (>2 mb @ 3000 pixels)!
LICENSE: CC0 (Public Domain)