I saw these Crystal objectives on the Warhammer 40k group on Google+ the other week. They were done by Sebastian Bajer and he was more than happy to let me put them on the blog. I'm pretty sure you can all see how they were done - sprue!
But I think Sebastian has managed to elevate such a simple material with the excellent paint job and the other base materials that compliment the green crystals.
Not only that they all match his terrain, which means that although they're on 25mm slotta-bases from a distance they all blend in practically seamlessly. Such a simple idea, no doubt seen before but such an easy thing to do to add some more terrain to your boards should you feel inclined to follow Sebastian's lead.