Here is just a small tweak (I woudn't call it fix) to the shingled Imperial houses. You get wood pieces instead of shingles in the edges of the roofs. That's all.

http://www.mediafire.com/download/hnot7d11phxbp77/Imperial+Houses+roof+tweaks.7z
Packed for Wrye Mash Install.
Compatibility with Windows Glow & KN Windows.
Enjoy.

Shots:
http://s1.directupload.net/images/130808/7cgrjerf.jpg
http://s7.directupload.net/images/130808/mmgk6xrz.jpg

You see, it depends entirely on your texture replacer if it appears less or more obvious (contrast between shingles.dds & Tx_wood_brown_posts_02.dds), this is for example my current one:
http://s14.directupload.net/images/130808/q6qqi4n9.jpg
http://s7.directupload.net/images/130808/uhl72hdd.jpg

The houses would need other stuff fixed, but that's nothing I can do with nifskope alone. Maybe after some xp in the future.