Watch the making-of video!
It was a lot of fun drawing and I think it shows.
This was initially a plain cardboard package holding a t-shirt, which I doodled all over (and gave as a gift). It was an attempt to make it look less dull (because plain cardboard can be very dull), so I decorated it and, in the end, it looks like it's part of the print!
The t-shirt inside looked like this:
And you can buy it here: Redbubble shop