Summer Break ZBrush Practise

Here are some updates of what I did during my summer break, me and my comrade Mike are making a underwater world for fun, so all the rocks are supposed to simulate underwater rocks, kinda like corals and volcano, anyhow they need to have very coarse and rough surfaces. These are just ZBrush practices, I have also UV and textured them, they look great in our environment, Mike has the .udk file, so I don't have the textured version of rocks with me. Here are just some sculptures of part of the rocks: