Space to change the backdrop. Click the dens to change them. Click the fresh-kill pile to change it. Hover cursor over dens to see which den they are. Drag dens to change their location. Drag the fresh-kill pile to move it. Drag the elder around to move him/her.
Feel free to suggest den or background ideas! The medicine cat is the cat with the flower in his/her mouth, the elder is lying down, and the kit is the smallest. UPDATE: Added snowy background(thanks to @Terragamer101 ), added elder, added fresh-kill pile