filler middle names

[quitmyscene.livejournal.com]

I feel like every girl my age has one of the following middle names:
-Lynn
-Ann
-Marie
-Rose
-Elizabeth

More recently, I've heard "Grace" being used a lot as a middle name (or similar things like Joy and Hope). For boys, I think Joseph, Michael and James are most popular.

Now, I get that some of these names might have a family significance for you... but for most people, everyone has them because they just "go" and sound good with almost everything. What "filler" middle names do you like best? Do you think you would use one or would you try to find something less popular, even if it might not flow as well? I bring this up because I was looking at my list today and noticed I have "Elliott James" and "Nolan Michael" on there... I don't even particularly like James or Michael (though, I don't dislike them) and realized I only have them because they sound good and were extremely easy to come up with.

On a related note, what names do you like but would only use as a middle name? Any reason why you wouldn't use it as a first name?