Check out a free pack by Boris Kiselicki that will help you create all kinds of monsters in ZBrush.
This Brush is handy for creating really fast interesting Creature shapes. All 55 parts are retopolized and on a low subdivision level. For the best result dynamesh and divide the parts some times.
The Vol.01 KiselMonsterKitbash Brush is free to use for personal or commercial projects, have fun.
You can learn more here.