I like this quite a bit. It's quite bright but is cool to look at. I also like the fact that the lower left/upper right matches in size, as well as the lower left/ upper right.
I like the rainbow of colors shooting out from the middle. That's pretty cool. I think a little bit of shadowing on the "lava" itself might make it look a little more realistic.
For in and out, above, about, below,
'Tis nothing but a Magic Shadow-show,
Play'd in a Box whose Candle is the Sun,
Round which we Phantom Figures come and go.
From Edward Fitzgerald's Rubaiyat of Omar Khayyam