What To Write Next?

I am in between books right now, and I'm trying to figure out what to write next. I could write another installment of my "Rose of Skibbereen" series, because the last one ended in the mid-1970s, and there are certainly more stories to be told about the descendants of Rose Sullivan McCarthy. I have this perverse character trait, though, that gives me a fear of being stereotyped. I know a lot of writers would keep mining the vein they started, which in my case would be the saga of Rose and her family.
However, the rambunctious imp in me wants to do something different. "How about a horror story?" the imp says. "Or, maybe a one-act play? Now, that would be fun!" Those are the conversations I hear in my head every day when I'm between books. I can't go too long without writing something, so I'll have to choose a project soon. We'll see if the imp convinces me to do what he wants. Anyone want to make a request? I'll consider most requests, unless it involves writing a massive historical novel that would take years to research and write, because, well, I just don't want to be holed up at my writing desk that long. 

Actually, I've got a notebook with some ideas jotted down, and a few of them involve the horror genre. I haven't thought about scary stories in a while, but for some reason the idea of writing a good old-fashioned, hide-under-the-covers yarn strikes me as a worthy project. We'll see what transpires in the next few weeks.