DIY concrete fire pit bowl from eHow. Summary: Make sand 'hill' in size you want bowl to be and, using a trowel, cover sand with layers of concrete, smooth a flat bottom to sit it on and vent holes, letting dry slowly under plastic sheet. Invert when dry and voila!
(PAIGE) A simple yet effective design. A fire pit made from concrete to form a sphere will weather well in the environment and could also be incorporated inside by designing a fire place in a similar style to modernise an interior space.