There’s something weird in some images from this artist: they’re clearly not anti-aliased originally (see >>247610 (merged) for example, the original PNG has no anti-aliasing (but >>247593 (merged) has)), but merely slightly resized using some low-quality algorithm to induce slight blurriness. This has been done after adding a “DeviantArt green” background and the blurring makes it impossible to change the background color afterwards. Meaning, if you want to make a wallpaper out of this, you can’t. Unless you like DeviantArt green.