You might consider getting a "Sundowner" so you can use x-10 to have the outside lights come on at dusk and off at dawn.

You might also want to get one of the x-10 "alarm clock" devices so you can have your coffee pot and kitchen lights come on in the morning when you are getting ready for work.

I am sure the folks here can think of other x-10 projects. If you ever need help getting ideas to further your x-10 adiction, we'll be glad to help.