Yes, you can embed an Halbach Array, into your own Papercraft projects!
And what the heck's an Halbach Array?
Just put a lot of Magnets on a row, easch one 90 degrees rotated in relation to the previous one, like this...
In that picture, almost all of BOTH the magnet's poles strenght is on the bottom side!
So where to get a lot of Magnets, say, for a Papercraft Toy Monorail?
On the Magnetic bands you find on the doors of discarded refrigeratos, that's where!
Then I went and made a Proof-of-Concept Video, it's a makeshift thing, so you can and will make something a lot better-looking, notice, the underside has all the strenght, so it's turned up, so the magnets repel each other, lifting the "monorail train", a simple plastic U-shaped thing, with additional flaps to grab the track:
Now, go and use this idea, on your papercraft stuff! :D