...I would suggest you don't worry about the color. Natural leather does darken considerably, and the good part is it won't stain your pants.
If you don't find what you want, let me know. I have some awesomely thick leather (6.5 mm) from which I can make a pretty tough saddle.
I'll vouch for Rudi's saddle. And I need to take another picture of it after a season of ridding. The color is darkening and looks great!