Ok, so it's not my comics room, but I've shown that one enough already...but it has a comic theme, so bear with me
Last year I finished my little home theater and decided to only use three colors in the entire room. White, black and red.
The room is pitch black most of the time as I only use it to watch movies on a giant screen and play Xbox. Now the last year it's become more and more the place where I also flop down on the couch (red of course) to read a book and basically hide from the rest of the world.
So after a while those all white walls (+ all white ceiling) started to look "too clean" and I wanted to ad something.
First idea was to get a movie themed poster, but all the ones I liked were done to death, plus I wanted to stay with the black/white/red pattern.
So I chose a Spider-man cover. I had a scan from the original cover art (which I believe a forumite owns), cleaned it up in Photoshop, coloured the title red and then blew up the entire piece using pixel magnification to get a Lichtenstein effect.
I then had to print it out on my trusty deskjet printer, 36 pages and three cartridges later I was left with a lot of grainy pages.
Spent a few days cutting everything, matchting everything up and then colouring in the mistakes (still not perfect).
I then glued everything together and put it up on the wall.
It's not perfect, but I'm still amazed what's possible these days with just a basic knowlege of Photoshop and a $50 printer
it's pretty big, I'm 6ft 2 and it's taller than me, here's the original comic for reference