I LOVE how easy and good on the bank account this project was! It is a great solution on what to do with firewood. Depending on how much you have will depend on how big you would need to make this. We don't use a ton of wood so this is how we built ours.
3 cinder blocks
2 2x4's both cut in half
(if you use a lot more firewood then we do, I would get 6 cinder blocks, longer 4x4's and, not cut the 2 2x4's in half, it will give you that extra height for more wood).
Now we will just cover it with a tarp once we get colder weather to keep all the wood dry. This only cost us barely $40.00 to make this project and you can whip it out in 5 mins or so. Enjoy :)