eye candy 
noun [mass noun] informal
Visual images that are superficially attractive and entertaining but intellectually undemanding: this movie looks like tasty eye candy...
- Major media are far more generally visual, and are often filled with out-and-out eye candy.
- More often than not they are a superfluous, if pleasant, eye candy that contributes nothing to the plot.
- You serve no useful purpose, except as a bit of eye candy for passing motorists and aren't contributing anything to the team.