Here is my DIY barbed wire tutorial for wargamers. It's simple, inexpensive and very convincing. You only need a few items to create barbed wire. This is a nice way of adding some small terrain details to any wargaming table.
This is a tutorial on creating custom rubble bases really simply with just three things. You can really crank these out in little time. It really adds some great visual interest to your miniature bases with little work.