Here's the scenery I was working on - none of it is complete yet but I paint scenery very quickly so it should take much more to get it all done.
Ork BS2 sucks - hence the fact that the sandbagged position has been missed by 4 Ork Rokkits, one of which has failed to even explode! Mix of Pegasus craters, Armorcast rokkit and some 1/35 sandbags
Armorcast barrels and tyres
GW Imperial Barriers
Water filled craters (Pegasus), they need the "water" muddying and another layer of water to level the surface.