With the latest Sparkbooth 6 update for Premium and DSLR licenses, stickers can be moved, resized, and rotated by guests. When a sticker is placed on the photo, the sticker will have touch controls for moving, resizing and rotating the sticker. Works great for applying virtual props to photos.
To allow guests to move, resize and rotate stickers, go to the Layout Editor and select the drawing area on the layout, and in the properties dialog enable "Make draggable". If the "Make draggable" settings is disabled, the stickers will be applied to the photo immediately instead of being movable.
Sparkbooth 6 also comes with a set of image set of virtual props. In the stickers list, select "Props" to enable these new stickers.