I did the paper towel in a plastic bag way and it worked great. I didn't put it in dark for a day and a half tho.
1st day I just put it on top of my desk here. Second day I put it in the room across the hall. (which was dark but not hot). Then I put it in the attic which is pretty hot about 90 degrees at least. In the attic when I pulled them out they germinated like crazy, They were grew about half an inch overnight.