They're actually a little big! Same sculptor, but they are more like 13 or 14mm, which when compared to GW's true 10mm stuff, looks HUGE!
Strominwolf, we'll have to check out N Scale stuff.
I'm considering getting some Cork Bark, stealing some polystyrene from the Automotive Design Department at Uni and building some harsh, cliff faced hills. I'll probably try and get some Lichen from a flower arranging shop too, just to stick on the board to make it a bit more interesting.
Otherwise, I'll probably scour the car boots for little house-ornaments that are the right scale.