This is probably one of my best works ever.
The original scan is a wallpaint appeared in Jigoku Shoujo episode 13.
Actually, it is drew by Yoshitoshi Abe. see here

I tried to make it look like a old Japanese artwork.
Different Japanese style patterns have been used in the wallpaper.

Concept:
A lot of butterflies sucking blood from Emma Ai's eye.
They are satisfied with the blood but the blood is poison for them.
Just like the victims in the story.
They are longing for salvation and finally they find Emma Ai - the Jigoku Shoujo.
However, Emma Ai is not a savior and will bring them to hell like the one they execrated.
Even though they understand the rule,
they would rather suffering in hell forever to exchange a moment of pleasure.
Humans are like butterflies, beautiful but fragile.
Don't you think so?

credit:
tExTuReMaTtIc
Shoofly-Stock

P.S.
As Mayuki commented the wall is too dark,
I have updated a lighter version:D
It is strange that the preview picture look darker than the original wall...