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Please add "Display window titles" and "Display window icon" on Desktop Grid. Both options are already available for "Present windows" effect, so it should not be that difficult to add it to Desktop Grid, I guess.
These are the basic options that could help to recognize which window represent which application in Desktop Grid, because when there are many windows open usually window's miniatures are becoming small and hardly recognizable. Please make it happen soon.
https://bugs.kde.org/show_bug.cgi?id=304628

This is an example of how bad it looks and how bad it is to manage windows - drug and drop to another desktop, when it is hard to recognize what application each window represent.
http://i.imgur.com/IoZInMk.jpg?1

mockup
http://i.imgur.com/ocSz1E2.jpg?1
http://forum.kde.org/viewtopic.php?f=226&t=118058