Whirlwinds. Just three of them, and I think I will stay at that number, at least for a time being. Painting was almost the same as with rhino apcs, I just wasn't sure what colors to use on missile racks. Finally, I've settled for colours of Imperial Fists legion, black and yellow, with just a small amount of red to make missiles a little more visible.
One thing is still missing of course - decals with legion's insignia. I will glue them on on all vehicles at the same time, after all my machines will be painted.