This thread may be the greatest thing on the net ever. Thank you so damn much.
If you are looking for more suggestions might I suggest UMvC3? Specifically the character select/Versus screen images and Menu background images. Heres an example.
http://i.imgur.com/iisXG9I.jpg
Also, totally not fighting game related but Lollipop Chainsaw and Metal Gear Rising have super awesome concept art galleries that are just dying to be ripped. I looked into it myself months ago but the files are in .xxx format which I have no idea what to do with.