Oyster
mushrooms (Pleurotus ostreatus) can be grown on spent espresso coffee grounds inside 5 gallon buckets in an indoor location, but make sure to design the
project so you don't breathe in the spores. A friend of mine had success with this method. Oysters are one of the best species for beginners. The blewit (Lepista nuda) can be grown on a mixture of hardwood chips, bark and leaves. They also like "the duff leftover from a recently moved woodpile". I have not tried to grow this species, as I don't care for the taste. You can buy spawn for both species from Field and Forest Products (fieldforest.net). You can keep both projects going by just adding more fresh material for the mycelium to consume. Although I've grown oyster mushroom on unbleached, "unused" toilet paper rolls, you probably won't have much luck with just the empty rolls. I just use them to start fires in my woodstove. Oyster mushrooms will probably eat the glossy magazine/
newspaper stuff, but I would not eat the resulting mushrooms, as they might contain toxins. Good luck!