My journal idea is:
Write out your own journal page for one of the characters. It could be at any point in time. Be creative, would some of them doodle, or if there had been a mission would they have drawn something out.
I am more then happy to run this competition or the favourite moments for the 100th episode celebrations, and will donate prizes.
The main problem with this is that we can't share stuff as easily for this on Facebook or Twitter because of spoilers, even on here it can be a bit of an issue. That would be the same with favourite moments.
I guess if we are clear on the competition pages (here and FB) that it will contain spoilers we could run with one or both.