I've been seeing a lot of people with black gift boxes instead of blue gift boxes. Is this from a previous event or something? What's inside?

Blue Wolf Sushi:
Those boxes that you see are actually the very same little giftbox you have equipped to your avatar, but they are just glitched. That is why they are the colour black instead xD Something to do with the Pinup clothing set or some such -nods-

Some people like Valdeil know how to glitch the color of things on their avatar.

Usually they have their avatar wear the "Pin Up" set which is found in the stores. It's a blackish set of clothes and the pants are a bit expensive.

Also glitched to a green, purple, and blue,
When changing hair colors.
That I know of.
It is glitched by the Ayumi skirts too.

Oh lol that's interesting. I read about color changing glitches in a thread dedicated to it but I don't remember reading anything about gift boxes changing color. Thank you for responding so quickly guys. :3

you mean like this? *points to giftbox equipped to avi*

Since your question has been answered, I'm going to lock this thread.