|Wrecked - Tehachapi, California|
First, the split-filter technique comes from the days of the darkroom. Basically, you expose the photo paper twice, once with a low-contrast filter and once with a high-contrast filter. This way you retain details in the highlights and shadows while having a contrasty image.
|Inside The Broken - Tehachapi, California|
First, open the image in Paint.NET. Make sure you have the "Layers" window open (click "Windows" at the top and then Layers). Click on "Adjustments" at the top and convert the image to black-and-white or (if you prefer) Sepia. I really like using "Sepia+" but that is a plug-in (you can find all sorts of free plug-ins with a Google search).
|Toppled Car - Tehachapi, California|
Go to the bottom layer and increase the contrast by about 25. All of these adjustments will be a little different for each image, so season to taste.
|Train Wheels - Tehachapi, California|
That's it! I told you this was simple.