I think one of the coolest gifts I ever got was a lava lamp. And I didn't get it until I was in college.
Lava lamps were fascinating items when I was a kid. Watching them in stores was amazing. The easily surpassed those other kitschy items: the miniature Venus de Milo surrounded my what looked like rain falling.
I'm actually on my second lava lamp now (same color scheme yellow wax in blue liquid in a brass stand) because the original one stopped circulating no matter how I changed the light bulb.
And today I read this article.
Friends of mine have a huge collection of lava lamps and variations on the theme. They have all different colors, plus glitter lamps that swirl.
It might be a night to turn on the lamp again. It's been a while.