One of the reasons some people may get into vinyl these days are for the artwork. When you have a 12″ x 12″ canvas to fill (more, actually, if you consider the back cover and the inside covers that come with gatefold sleeves), you have a lot of area to work with. Rupinder points to this article from Mental Floss that illustrates how there is more to an album cover than may initially meet the eye.
My favourite of the bunch is this Kate Bush album. What do you see? Are you sure?