I started a Legacy recently, except it has a couple of twists to it, the main one being that I combined it with the Black Widow challenge. So my founder is a female Romance Sim who keeps killing her lovers after having children with them; it's quite a challenge seeing as I have to find different ways to kill them off without cheating. On the up side, Ziporah (the founder) has never had to work - the men bring in enough money!
It's pretty fantasy/elfish, I want to see how long the elf ears will stay in the family. I'm also naming the children backwards-alphabetically, so her two daughters are Yeira and Yaeli, and their children will have X names. Oh yeah, and her last name is Zanza. No particular reason, I just thought it sounded neat with her name. XD
Yeah, it's pretty different... I don't like playing typical normal families, so I had to spice it up somehow. The black widow thing works well. It's going to get old though, so I may switch to a different secondary challenge for the next generation.