I've made a costum item of Missingno.. I don't know if any exist but here it is.
I've used the sprites of Missingno, of course, H POKé and 3TrainerPoké form Pokémon Yellow. It's just like Zukan figures 1/40 scale and looks really awesome!
Here is a paper model.
Just print and fold it and there is your own missingno!!
Oh btw the flaps where you put the glue on are a bit too small, if you cut them a little bit bigger it's easier too glue this thing together.
Thanks for reading.