This is a toggleable Nether Portal design (It works with all portal sizes in 1.7.2) that I came up with that uses few resources and does not use Fire Charges, but Flint and Steel instead. If you have any questions or requests, please put them in the comment section below. the link to watch this video on YouTube is: http://youtu.be/RVi37qwTRec. Thank you for watching!