I just thought of something that hasn't been discussed yet.
I've just finished my converting my marine for the warseer chapter (obviously waiting for the colourscheme & emblem to be decided upon, here he is if you want to see him. Brother Angelus) when I realised that we haven't decided on how to base our marines.
What kind of world are they crusading on? Ash wastes, grassy plains, barren desert, snow & ice, ruined city...the list goes on. This is a minor thing but no marine can be finished without it. So I have started a poll so people can vote on their favourite landscape for our valiant chapter to do battle on.
So go ahead, vote, it's your civic duty