Here's another sketchy, glazed atrium concept house in AO.
Quality: Very Low; rendered resolution: my screen size of 1540x742; average time: 1 minute (except the last one, rendered in Quality: Low, time: 5,5 minutes; no post production (no Photoshop, etc.).
With default "Valley..." environment
My final settings
Same as previous, in plain AO (no color), solid white background
This last one, in "Quality: Low" first crashed my PC: my guess is the problem comes from Cache transfers not fast enough, or too busy kind of!?! Hope this problem will disappear in a close future!