Marley Simplay Peel and Stock Floor Tiles . These have a lovely design fleck in them. You will see from the photos that these were originally. part of a range of great varying colours. I have a few here is beige and orange and also a scan of each is available should you require to cover a larger area .
These are 25cm square and there are some other Marley Tiles at Retrolino that are the same size (I have but are not from the same range) if you wanted to mix a match an interesting floor !