On the DeviantArt I found one very nice and awesome fan-art with "real-life" Sarah Kerrigan byertacaltinoz (original art). BroodWar cover recreation. Based on official Jim Raynor's wallpaper (we can see it all times, if we start SC2:WoL game).
I've slighty edited original fan-art: added flame eyes and completely closing the mouth (in the original you can see teeth), zerg top and bottom interface, recolored from toxin-greeny to orange-grey
*removed, because ertacaltinoz disliked it and wanted to remove this reworked artwork. Now I can provide you this wallpaper only with PM*
This loading screen replacement for your own risk.