I've seen this tag on books, and occasionally I have the book and might possibly be able to provide an image, but I don't know how it is done, and I'm not terribly computer savvy?  But I would be willing to add an image if I could figure it out.  I know that it adds a lot to be able to see a cover.

all you have to do is save a jpeg image of the cover, make sure that it is cropped and there is no white space on either side of the photo (Amazon is the worst about this).

once you have that and the ISBN, use the link at the bottom of the page that says Upload Book Covers.  Put in the ISBN and the link to the image on your PC and then upload.

it is really easy and it is nice when others try and help out.  I randomly go through and find images when I can and I also agree that it looks better than the blue square!