Make This Lava Lamp Bubble and Churn Yourself

When I say "yourself," I mean "whack a tealight candle underneath." It's certainly more DIY than plugging it into a wall socket and flicking the switch. One tealight is good for around three hours of '70s-style fun.

The Fireflow 01 is available from Mathmos for $69 / £35. [Mathmos via 7Gadgets via CrunchGear]