Getting some help is also never a bad thing. Also, before you look at how to do this, think of what you want your artwork to show? Do you want it to be really catchy and nothing else, or do you want it to have a deeper meaning?

Yeah, what the evil chocolate... said above - what do you want it toshow? Thanks for info about dummyimage.com I am going to look that up. Also, brushtone - is it for windows or mac?

If this Brushtone is the same Brushtone that I got as the first result, then it is a website; not an app. And I couldn't find anything regarding album artwork. They produce videos and social media posts though. So you may visit brushtone.com.

No.
It is not a website.

I see.
So let me check the results in more detail.

This program is little strange, but if You really want, here It is:
https://sysop-delco.itch.io/brushtone

Wow, it is not intended particularly to make cover arts. You can examine and create anything with that. Excited to try it.

OK.
I have also heard by My sighted friends, that It is not good to create for example circles, because those circles are of little cubes, or something, like this.
Ofcourse, You can try It and also, write to author of this software to comments.

Hmm, well, I will mess around with this thing and ask my brother what he sees on the screen. But for that, I need either to return home two weeks later, or send the images I make to my brother. So hope I can do either of those.

OK, You can try that, but I think, that It just sucks.
Also, this software has been created by blind person, or partially sighted. I am not sure.

Well, at least it lets me examine existing images, doesn't it?

You can do that, if You want.

I could not get brushtone to work at all. Strange... I tried to examine an existing thing but it wasn't very helpful.