I recently bought these builder sheets of stonework/cobbles that will be very useful in all sorts of projects. These are probably well known by railway enthusiasts but are a relatively new discovery for me.
I'm sure I will be finding these useful one way or another for a long time. I'm really pleased with the quality of the sheets, especially when they work out between 70p-£1 per sheet depending on the set. Pretty good value in my book.
I'll certainly be keeping an eye out for more products like this in future.