Hey, why don't you come up with a fallen house?
For your house to look good include:
House name
House colors (background then design)
Archon
Servitor
Origins
Like this:
The house of sacrifice
Black, red
Archon Rokul
Servitor Ultimum Prime
These are the extremes of the fallen, those who worship their Servitor with undying faith, until death. They sacrifice those of the other houses as we as other species. They are even willing to perform their rituals on themselves.
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House of Jhereg. Colors are black and grey. Doubt many here will know it.