I use the following program

http://www.spiralgraphics.biz/

"Genetica 2.5 is an innovative node-based seamless texture editor for professional 3D artists. With effect maps, more than 500 finished texture presets of all types, automatic seamlessness, and unprecedented flexibility, Genetica will help you revolutionize your textures."

The benefit is that
a. the textures look sharp
b. easy to make
c. look consistent with the rest of your textures