again thanks for all the tips and feedback. today i got the stones and groundcover and will play around with that ...

i rendered a building we are developing with vue's rock and grass material and from this distant it looks ok i think (esp considering its a kindergarten where the grass is not green everywhere :)

(image is copyright 2009 LukasLang Building Technologies)

the grassroof needs to be worked on. looks too fluffy. i used the vue grass material scaled down at 0.5 ...

the white background is on purpose for now as i have no idea what to make there (street, fence ....)