Here are some of my creations which I designed last winter. You can use them (for example) as wallpapers for your operating system (Linux, Windows, Android, MacOS ect). All of these come in a relatively high resolution (2560 pixel in width and 850 kilobytes upto 3 megabytes in filesize, JPEG image format) and free of charge! I made them with a combination of digital image processing software (how exactly, forgive me, shall remain my secret). Do whatever you like with them. However, I’d appreciate if you mentioned me/novaspero.net if you get asked where you got this stuff. Thank you.