I will try to convince you again , try with 3-4 interesting textures , you cant go wrong there , noise is almost invisible , and on SS they don't reject photos for "we have too much of those " reasons.
Again , avoid skies , especially avoid processing images with sky , don't take unnecessary risk.
Good luck
I just got in a few hours ago.
I used 4 white isolations, 1 true and 3 with light shadows, one of the ones with light shadows was rejected.
I had 1 cityscape, approved
http://www.flickr.com/photos/waldo4/2261674159/in/set-72157602933123778/Much different processing, honestly the processing on this Flickr image looks like crap, overfiltered and oversaturated. This was part of my IS application as well, a rejection on the first try prompted the reprocessing.
1 texture, approved
1 shot of some really interesting gas meters (honestly) on a brick wall approved
http://www.flickr.com/photos/waldo4/2238384500/in/set-72157603843108654/Also part of my IS application
1 shot of ice being dropped into a glass of water, strobed in the dark on a dark surface approved
http://www.flickr.com/photos/waldo4/2262379956/in/set-72157602938076813/1 architectural shot denied (for shadows, though one of the main interesting points of the shots was the shadows)
http://www.flickr.com/photos/waldo4/2270316132/in/set-72157602934009472/1 shot of a landing airplane, denied for noise (has to be on the plane, the sky is actually a flat color (IE painted), once I blurred for noise I got banding, the sky was uniform enough though so I just painted the whole thing).
http://www.flickr.com/photos/waldo4/2275824639/Part of my IS application
The IS application shots I listed were all approved.
Not all my shots are on my Flickr account (sorry, I don't post isolations or textures, Flickr is for my actual artistic photo pursuits, not my stock pursuits, though there is a little overlap, almost all Flickr shots are a slightly different processing than my stock shots).
If anybody has the time to look at my "abstract architecture" set.
http://www.flickr.com/photos/waldo4/sets/72157603438672995/I'd love to know if you think that some of them are stock worthy, or it is a stock worthy style, it is my favorite type of photography and IMO what I am best at.