Android thumbnail gone

[AC Question]

Hi.
I recently deleted a thumbnail with avast security, now my design is white and black, my thumbnails are gone and like i said my design is ruined. I will add some photos when I get home

 

[B. Diddy]

Welcome to Android Central! Which device? What design do you mean? Are you talking about app shortcut icons on the homescreen, or thumbnails in your Gallery app?