I'm not sure if this has been posted yet, but there is an interesting lava lamp trying to get funded that is filled with ferro fluid, the magnetic fluid that makes spikey type shapes when a magnet is placed near it.
Im not affiliated at all, just a fan of ooze and goo!
interesting and fun to play with, but it's not nothing new.
Ferro Fluid lamps are readily available
Ahhhh, I did not know that.
I'm actually the guy behind both of the ferrofluid lava lamps.
Well, I think it's cool. Thanks for helping to keep the lava alive!