I turned the Kaleido Star wallpaper grayscale as a test and discovered I have a few walls that look kinda decent in black & white :D These walls weren't just turned to b&w, though; all got a contrast and brightness adjustment as well so as not to look too faded.
You can see the resolutions they're available in in the image below. Enjoy!

Download:
[Bitter Virgin] Another Day In Paradise
[Bloody Kiss] At the Beginning
[Artist - Midori Foo] Daddy Cool
[Kaleido Star] My Place
[DOGS] Never Silent
[Mirai no Kioku] Stay Like This
[Artist - Benjamin] Passion For Life
[Artist - Kunie Kanbara] The Seasons are Changing
Download all

Originals:
[Bitter Virgin] Another Day In Paradise
[Bloody Kiss] At the Beginning
[Artist - Midori Foo] Daddy Cool
[Kaleido Star] My Place
[DOGS] Never Silent
[Mirai no Kioku] Stay Like This
[Artist - Benjamin] Passion For Life
[Artist - Kunie Kanbara] The Seasons are Changing