Blending layers in photoshop.

I have been playing with Photoshop this morning, I have to admit I am not all that knowledgeable, I have learnt most of what I know by goggling! I suddenly had this idea that combining a few layers might look quite cool so through a process of clicking on various tools I discovered that the "multiply" tool work's brilliantly,
it's always exciting coming up with something that's likely to create a whole new direction!