Chaos Portal

I've seen this sort of portal attempted a number of times -- it is simply the Warhammer Fantasy arcane ruins (in this case with pillars from the temple of skulls, I believe) with a portal attached to it.  The portal pictured here is a swirly sheet painted in purples and pink / reds.  Ideal for an objective for daemons or chaos space marines, or for locating a warp rift (etc.).