Thanks clyde, I prefer to use my own scans for most materials, this cuts down render times by huge chunks. The marbles in these pics are scanned from sample 30cm x 30cm floor tiles, if I was not so lazy I would scan more for variety, I use them at 100 - 150dpi for close detail and 72dpi in the background. When importing picts I reckon that the default ambience setting is way too high and fuzzes up the images but that is a matter of taste. Cheers!