Joseph Corsentino is no longer licensing out of MPT, BUT, I wrote the tutorial so you could pretty much drop any tube in there in it would work. I tried it out with about half a dozen.
The scraps are from the Stargazing PTU kit from Nette's NightOwl Works. (You could even stick one of the cookies from the kit in there and it would look nice.)
Try it for yourself at Di Before Dawn tutorials.