I like how everybody's whinging about how celebrating it on Gaia would be promoting 'illegal' drug use. Here in California- the home of Gaia HQ, mind- it really kind of isn't.
Anyway, it'd be lulzy to have an item for it, but I'm not really sure what's left for them to make. We already have hippie stuff, a dime bag, high eyes... oh, no, wait, we don't have any glass pipes yet. A pretty brightly-colored glass pipe would make a good 4/20 tribute. ...And as they tell you in any pipe shop, their products are only for tobacco! If you say you're using it for pot, they'll kick you out! XD
I like when they make items for little holidays. The Pi Day slice was fun. They should definitely do an item for Talk-Like-A-Pirate Day, if only to make people shut the ******** up about it.