If you prefer high contrast, search for "fallen angel" themes. These often feature black wings and midnight-blue or crimson backgrounds, like the Midnight Blackwing featured on Wallpaper Abyss .

Serene Angel - HD Anime Wallpaper | 1920x1200 | Wallpaper Abyss Wallpaper Abyss - Alpha Coders

For something bold, try Anime Angels from WallpaperAccess that incorporate magical elements like glowing runes, floating feathers, or cosmic backdrops.