Played a game of Orks vs. Space Marines (well, tbh I've just supervised it ^^), with the suggested retinues in the Retinues book, just to show the game to a couple of friends, who loved it and had great fun.
I've took some pics, here they are, in all their glorious grainy grayness :P
Grenades are deadly!
Final onslaught. HtH is deadly, too.