In 2004 I got the odd urge to play a bunch of my old computer games. After playing Day of the Tentacle, and having a blast doing so, I thought to myself, "I want a Purple Tentacle plush." So I made one. I am in the process of making what, I hope, is a more accurate one without the arms. I hope to one day make old Purple Tentacle, with shrink ray!, and even the original Purple Tentacle from the Maniac Mansion game.
The non-plush Purple Tentacle images were taken from screencaps from the game.