I use a MAC... are these textures for me?

Yes.  The texture collections are high res jpgs.  If you download the collection you will need to open a zipped .exe file.

To open that use Stuffit Expander. http://www.stuffit.com it is a free download.

 
Textures of the Middle East
Cityscape Urban city textures Landscape Architecture Tree plant and shrub texture
Townscape town building wall street textures
Winter Environment Pack textures of the winter snow ice ski hill Bricks and Mortar lots of brick textures high resolution
Absolute Essential essential dirt grime and rust textures