But now you have my mind running with a few ideas for threads. Just need to check if they've been done already...

Even if they have, you might have a fresh angle, or they might be one of the ones I was refering to above, where suddenly members are more interested than when they first appeared. I've seen it happen a lot.
Using the search for subjects that have been discussed recently is a good idea, but if your subject isn't exactly the same, or if it's been a while, it can often spark an entirely new discussion.
Marilyn