The texture editor in Carrara is very robust. I've covered many of the methods in my tutorials. http://www.markbremmer.com/3Bpages/tutorials.html 

I also have some free ones in the Dark Arts section also. Texturing is almost the most complex/versatile capability of Carrara. Like chess, the rules are easy to pick up but getting creative is where things get more fun.

Here's some others:
http://www.awbenson.com/tutorials.htm
http://forums.polyloop.net/carrara-tutorials/
http://www.daz3d.com/i.x/tutorial/0/-/?tut_cat=11