Free backdrops :) , press space to see them all. If you don't know how to use the backpack, I'll tell you right now. 1. Click on the word backpack (you will find it at the bottom of a project inside ok). 2. When the backpack opens click and drag the sprite, sound or/ and backdrop. 3. Open your own project, open backpack click and drag sound, sprite or/and background to it's category e.g. sounds - sounds category.
All by me :D