East Bound and Down, Season Three, Episode Five
Kenny Powers has a blue and red lava lamp running beautifully in his kid's bedroom.
Good, clear flow to you all,
The Sopranos season 1 episode 3
Meadow goes over to Christopher's house with her friend to score some meth and at the 18:30 mark a flowing lava lamp can be seen in his pad.
I remember watching The Prisoner on TV when I was little. I think that is were I first saw a Lava Lamp. The link below goes to a documentary-et on YouTube.