Hi, I am trying to make a tiled roof and I am wondering if anyone knows of a way to do a reasonable job by texturing rather than modelling?

I really, really do not want to have to model a billion roof tiles if I can avoid it, as my (ostensibly quite high-end) computer is very sensitive to processing large amounts of data.

I think I already know what the answer to this is going to be . . . so any suggestions would be very welcome!