Can the snack itself be attractive?

Of course!

http://www.google.com/search?hl=en&rls=com.microsoft%3Aen-us%3AIE-SearchBox&rlz=1I7GGIE_en&q=nutrition+snacks+attractive

Yes, the snack itself can be attractive. The attractiveness of a snack often depends on various factors such as its visual appeal, presentation, colors, textures, and overall aesthetic. A visually appealing snack can be more enticing and enjoyable to eat.