Don't try to use Mole grips as tongs; it's dangerous; they only grip along a line and allow the work to move, it is difficult to reposition the metal and they can fly open with no warning (often giving your fingers a jar as they do so.
Compared with the price of 6mm round bar (about £2.00 for 20 feet) that's expensive! John's examples use the original shape of the nails to decorative advantage, making a common rose out of the distinctive head seems counter productive, you could use anything for that.
Buying horseshoe nails is an expensive way of obtaining stock bar. Those are known as "Russian Roses" I believe; there's instructions in the blueprints.
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