Blend textures

Is it possible to blend textures (not just colors?)

Yes. Use a stencil map.

Yes. Use a stencil map.[/quote]
What is “stencil map” and how do I use it?

Yes. Use a stencil map.[/quote]
What is “stencil map” and how do I use it?[/quote]

Sorry, I was a bit short with my answer:
http://mediawiki.blender.org/index.php/Manual/PartIV/Map_To