Ok boys, lets not get our panties in a bunch.
yes, the original question about "off road" bumpers was a little vague, and CSP made a good point about being a little more specific with your questions.
There are many types and designs of "off road" bumpers. For example, someone that does a lot of high speed stuff in the desert is not going to have the same design of bumper as someone who wheels mostly on wooded trails.
If you wanted, you could take a piece of 6" drain pipe, and weld it to the frame, and call it an "off road bumper".