Hello, thanks a lot for all this replies !
Happy you like it, it was just an exercice, but yes may be i will add some grass.
The house: 96 000 polys
The ivy (made with ivy generator): 1 million polys ! (not the good settings may be...)
You can download the model (and use it !) here:
http://www.blendswap.com/wp-content/upl ... ison.blend
(it's without ivy, it was too big)

blender 2.49 - Octane pre-Beta2.3v5 - NVIDIA GeForce GTX 260 - cudatoolkit_3.2.16_win_32 - driver
260.99_desktop_winxp_32bit_international_whql - windows xp - 3.25 Go RAM