Oddly, the Playstation site isn't uniform about their "boxart" as they will sometimes create a box art, and other times use a PSN store icon. Also, they do not have a large box art for their games. The thing about PSN is that you kind of don't want to show the Disc Box Art, since you are downloading the game and not actually buying a case with a book and disc. If you look at my PS3 collection, you can see I unfortunately have a mix of either the store icon in it's box shape, or the rectangular icon used when you scroll through your list of games and save files. While I don't like them mixed, it is better than having no box art, but some people have just used the actual PS3 case as box art for a downloadable game.
http://vgcollect.com/jonathonstriker/psnAlso, the playstation store only shows a small image for the "boxart" where I could just get a larger picture from gamefaqs. gamefaqs doesn't always have the icons I use though so that is what is making the PSN sections (PSN PS3 and PSN PSP) difficult to make uniform, although I am trying my best for my contributions as I update my collection database.
PS: jcalder8: if you want to see the the problem I had about not finding something, search for Patapon 2 for PSP. You will see they only show the physical box while Patapon 1 only has a "demo" icon and Patapon 3 has several. Patapon 2 was originally downloadable only, and did have a voucher sold in stores, but not everyone got that voucher. So technically their should be 3 versions, Patapon 2 "disc version", Patapon 2 (Download Voucher), and just the Patapon 2 under the PSN PSP category for those who did not buy the voucher.