That shirt is from the Basics 1 set, correct? There are some other colors under the materials tab in the library. Look in LH Basics 1 in the materials for a choice of colors.

You could make your own texture maps (that's what the image files used to make the textures are called) if you're proficient in Photoshop (or similar program)

You've never said which render engine you're planning to use, but there are some shaders available that can be used for anything but it would depend which render engine you want to use.

Or as Hborre said, you could make your own shaders, but those sometimes get advanced.

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