What is a good way of showing your friends you really care about them?

I have a group of friends, they're the best friends I have and I think the world of them. I think they kind of know, and think highly of me too, but I've never been very good at expressing myself or my feelings, and even if I did come out and just say this to them, I don't think they'd believe it. Is there any other way of getting the message across in a way that they'd appreciate and understand? We're a group of lads and emotions have never been our strong point....