If you've read the blog for a while, or delved into the depths, you probably know there's a lot of unusual material buried away. One of the older projects is the Orkosystem, which was a collaboration with Roll With It looking at smaller parts of the 40K Ork ecosystem.
If you play Orks, or with Ork players, and if your gaming group is open to other ideas, it might be worth a look, especially with sixth edition mixing things up since it was posted.
And sixth is why I'm bringing it up: I've gone back and added an anti-aircraft option to the last Orkosystem entry. Partly because some of us think flyers in 28mm are too big for a 6' x 4' table, or for whatever reason don't want to field an Ork jet - which is a fairly helpful flyer counter-measure in the Ork list - and partly for more freedom, depth and character.
So now, rather than just circling over the field on recon with its snotling pilot or tellykam, a Spotta Squig can have a go at knocking out enemy flyers. Not by choice of course...