Game of thrones definitely made a splash with their dragon eggs. This Do-It-Yourself tutorial is really easy and inexpensive. Check it out.
A foam egg (3″ is a great size)
For one 3″ dragon egg it takes a little over one pack of thumbtacks 200 count.
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Starting at the bottom gently push in the thumb tacks overlapping them slightly. Continue to the top. Took me about 45 minutes to do one 3″ tall egg. You could possibly spray paint these or use gold thumb tacks. Be careful inserting the pins. If you wiggle them too much it creates a large whole in the egg and they will fall out. These eggs are meant to be viewed and not handled much.