Hi All

I wanted to cut a drain over, and saw ages ago some plastic that looked like stone, as in cream colour with grey and black flecks in it, but I'm not sure what it's called of where to get it. I have tried googling it but comes up blank so I know its a bit vague but if anyone has seen something like that please let me know. I need a bit 300mm square by about 15mm thick.

Many thanks

:) Don