How to access the OTHER half of texture? (after applying mirror modifeir to a textured half) I am new to Blender, and have created and textured (painted) a symmetrical model using the mirror modifier (this character is 99% symmetrical in shape and colour). 

Now I want to do some further work on it as a NON-symmetrical object, with textures and geometrical changes on one side only. But I have no idea how to do this.

Is there a way to generate a new completed texture from this image? Preferably retaining the relative position of the UV mesh on the texture I made? I'd prefer to avoid creating a non-symmetrical texture from scratch, as this object requires a highly detailed texture that needs to be 99% symmetrical. It also needs to be low-poly.

Cheers.
Apply the mirror modifier. If you dont apply it before unwrapping, both sites will be overlapped (usefull if you want symetrical textures). 

Hope it helps.