If you look closely a lot of the terrain is the pictorial style on felt and it has become quite popular at meetings
I go to. It's made by a Spanish company. On the table it looks fine, if map like. It also has a slightly
washed out look so doesn't stand out well on the light table coverings we had for FoG; it's best on a dark
painted table.
I did take some model trees for my terrain options, but in 3 of the 4 games I played I put a plantation
out only for my opponent to roll a 6!
But otherwise personally I'm using cork tiles at the moment. Perhaps not the best, and with the terrain
options and sizes changing slightly in FoG I need to look at upgrading it. I have been thinking about doing
some colour-coded terrain for the different options as the number of options seems greater than DBM
and I find it slightly confusing to remember - perhaps because I don't draw it on a map anymore!

I was thinking sandy yellow for uneven, darker for rough, green for difficult and grey for impassible,
hills excepted.
But it's always going to have to be (relatively) flat and light. There's only so much you can pack and
carry to a meeting.
Rgds,
Peter