As a couple of people asked in the comments of the previous posts I've put together a tutorial for the rusty bases so here you go.
Most of what I learned about putting together interesting bases came from reading through the amazing tutorials and looking at the amazing eye candy on the Massive Voodoo blog so I can't take full credit for the results so after you've had a look at my quick tutorial go give their blog a gander as it'll inpire you.
Step 1: Picking your scrap
Step 2: Covering your fingers in glue
Once this is all dry you should be able to pin your mini to the scrap heap.
STEP 3: Painting
Once you've under-coated your base black give it dry brush with a couple of different silvers.
Once your silver is dry, dry-brush up from dark bronze to light, next take your orange paint and slap some on randomly on the edges and in patches to simulate rust.