this is my approach on the udk environment we made in the course ART_I_2010.
we learned about the landscape tool in udk, learned how to create believable landscape textures.
then had some hours in speedtree
and afterall filled the scene with some additional props.
in this scene i used lightmass and not only the realtime lights
i placed a bunker into the scene that i made with course ART_I_2011 some months ago.
for a good looking objectplacement it is neccessary that you put your objects in piles or object islands. placing grasses all over the place without some direction or context will make the scene looking totally random and unrealistic