The purple plates get Shyish Purple over the base, and they're done.
For the glowy bits, White Scar basecoat, followed by Phoenician Purple . Kakophoni Purple over this, followed by Acid Pink
Druchii Violet wash over all the gold, to turn it a brassy colour, and then apply a little to the glowy parts to tone them down a little bit and provide definition.
The bases are Armageddon Dust with a coat of Aggaros Dunes over it, and any rocks.