Heh, I had quite a lot of fun setting both FF and Valar (Silmarillion) households. The households I have include:
Valentine - Seph, Cloud and Squall
(so named because of the fanon thing of Seph being Vincent's son - I don't have a Vincent skin, the only one I found was terrible)
Garden - Rinoa, Quistis, Selphie, Fujin
SeeD - Seifer, Zell, Irvine
Turk - Rufus, Reno, Rude, Elena
Gainsborough - Zack, Aeris
Spira - Auron, Lulu, Kimhari, Wakka, Tidus, Yuna, Riku

I also have Unhoused:
Krammer - Edea, Yuffie, Jecht, Lenne, Jessie, Paine

I have Shiva living in the Mandos house (Mandos is the Silm Halls of the Dead - reputed to very cold), Siren in the Sealord house (the house of the Valar of the Sea, Ulmo), Ultemacia living with Morgoth and Sauron.

As well as those I have a Sailor Moon house with the main Sailor Scouts, Chibi Usa and Tuxedo Mask, and the Townsend family which is based on the Powerpuff Girls, though I used my Hojo skin for the Professor... o.O

I also recently found a Shuyin skin so I'll make him up and set him and Lenne up in their own house.