[Android Central Question]

My home screen is just completely grey except a Google search bar at the top of my screen. The only way I can get onto my apps is through notifications.

[mr_master]

Did you set that launcher as your default launcher? Go into Settings (either through the notification shade or by searching for the Settings app using the Google search bar) > Apps > Bling Launcher > Defaults > Clear defaults. Then tap the Home button and select your previous launcher as the default launcher.

[belodion]

Boot into Safe Mode, go to Settings, Apps, then Clear Data for the app on question and Uninstall. Then exit Safe Mode.
Email the developer about the problem.

Edit: Posted same moment as above. My assumption was that it was a wallpaper app rather than a launcher, but if the latter, @mr_master's advice is certainly right.