Hello,
i am working at an addon that help you to texture your model with the clone Brush.
The wiki is here: http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/3D_interaction/bprojection
There is also video who explain how this addon can be used.
When you have time to try this, I would be glad to have some feedback, It would be very helpful for finding bug or improving the workflow.
Tanks.