I created a Facebook Cover for the farm I work for. We only recently opened a Facebook page, so it was lacking a "decent" cover image.

We produce and pack apples and I thought it would be nice to include both apples on the tree, apples in a packed box and our branded boxes stacked on a pallet to showcase what we do. 

We don't have a slogan, so I just went with something that is printed on our boxes as well. 

I tested the image on desktop, as well as my mobile and it looks good on both those platforms.