Basecrafts has created more colors for their basing components.
From their website:
People have been asking for more “supernatural” or “alien” basing components, after a bit of a search we’ve managed to source some green and violet crystal rocks. The green rocks are perfect for representing that magical rock the ratmen just love, or perhaps adding to the bases of everyone’s favourite glowing green mechanical aliens. The violet rocks work well on fantasy bases, representing magical rocks jutting through the landscape.
Both are available now as mini-pots and in the future in some new basing kits due in the new year.