supertux/data/images/objects/bonus_block/retro_brick.sprite

(supertux-sprite
      (action
        (name "empty")
        (surfaces
        (surface
        (diffuse-texture (file "box-empty.png"))
        (displacement-texture (file "displacement.png")))))

 (action
  (name "normal")
  (images "../../tiles/blocks/retro_brick.png"))
 )