Hello! I've made some test wallpapers for Haiku, one of them for Haiku Alpha2. If the team likes any of them, you can include it in the next release without any problem. I leave here the links.
Haiku Alpha 2 (from 1024 to 1600): http://pizte.deviantart.com/art/Haiku-Wallpaper-alpha2-137390047
Haiku wallpaper I (1024x768): http://pizte.deviantart.com/art/Haiku-Wallpaper-Test-I-137248486
Haiku wallpaper II (1024x768): http://pizte.deviantart.com/art/Haiku-Wallpaper-Test-II-137298356
Haiku wallpaper III (1600x1200): http://pizte.deviantart.com/art/Haiku-Wallpaper-Test-III-137388665
I have the source files, so I can make any resolution if needed. Hope you like them!