Download the Hana-Kimi wallpaper at wild-vanilla. Up until Dec. 31.
Here's a reverse harem-looking wallpaper from Petit Comic's. Title is Totsuzen Desu ga, Ashita Kekkon Shimasu. Check out mangaupdates for summary.
Another locked wallpaper from Sho-Comi. Found the second pic from the homepage. And upon more investigative work, I think it's based on the third pic which is an otome, Midnight Cinderella. Up until December 31.