Although I've never used this method, it sounds really simple and really fast compared to the log culture I normally do. In fact, I'm tempted to try this method myself after seeing how ridiculously easy it looks! Here's a really good video from Field & Forest on how to grow oyster mushrooms on toilet paper rolls:
Field & Forest sells their "TeePee Kits" for this method. One kit contains 7 filter patch bags, 2 lbs. Grey Dove Oyster spawn and rubber bands for $28. They've also got two other "TeePee" kits.
As you can see, they use grain spawn. I would also use unbleached toilet paper. Good luck and let us know how it goes!