I am looking for CSS style packages (not css layout templates nor css grid frameworks) which can define the general look and feel for line of business apps written in ASP.NET. The style file would include styles for the GridView (header, row, alt row), form elements, section headers..etc. The package preferably uses em's for dimensions, images for shaded backgrounds, semi glossy headers, rounded corners, nice buttons, good color coordination... The stuff that makes a business web app look polished and clean.
I am a developer but not a very good designer so I need to borrow from others.