Harlequin squash

I'm new to this squash growing lark but suspect that I ought to this harlequin squash soonish. It was one of the plants that popped up out of the compost I spread across the garden at the start of the year, I recall buying a squash similar to this from the True Food Co-op in Emmer Green and I would have put the seeds and skin into the compost, so that is where this one has come from.