I made a few backgrounds that I thought I'd put up. I haven't been doing graphics very long, so they aren't all that great. But anyway, I grouped them by anime.
Saikano
Color 1: #FFFFFF
Color 2: #006400
light/dark: dark
Color 1: #a08c97
Color 2: #445664
light/dark: dark
Mai-HiME
Color 1: #AFA2CD
Color 2: #CF7C52
light/dark: dark
Color 1: #CE953E
Color 2: #362CA6
light/dark: dark
Trigun
Color 1: #93B7FF
Color 2: #A43019
light/dark: dark
Darker Than Black
Color 1: #FFFFFF
Color 2: #006400
light/dark: dark
Air Gear
Color 1: #FF8C00
Color 2: #000080
light/dark: dark
Cowboy Bebop
Color 1: #FFFFFF
Color 2: #000000
light/dark: light
Nana
Color 1: #FFFFFF
Color 2: #000000
light/dark: dark