Lots of great ideas here and my postings about using cement blocks aren't meant to knock any of them. I've had a habit of collecting cement blocks whenever I get the chance for 30 years or so....so I may be a little biased. Cement blocks aren't for everyone but I suggest you snag 'em up when you can. They have quite a long half life. When I see the paint, etc. on these blocks it reminds me of the places I got them.
I have a couple of stacks like this out in the woods, an almost perfect habitat for paper wasp.
I sell just a little smoking wood and here is how I get 1/4 cord measurements. The 1/4 cord stack end 4x4's are from pallets and just happen to fit into the block cores. If you notice the wood supporting the tin on the wood shed...it is made from 12ft. long pallets. The stack of pallets on the left of the smoking wood are 12 footers I had left over and will be using them for sides if I don't let them stand there until they rot. Of course they are up on block, too.
Here's how I stack firewood in the woodshed on blocks. Note how one row of blocks catch the ends of two rows of firewood. I use metal soil erosion stakes to span the gap from the ground to the woodshed walls because they don't rot. I'm pretty sure the air movement under the wood rows speeds up drying quite a bit even though the stacks touch each other. As far as critters living under there....our 3 cats go in and out of the passage ways working as a team!
Man, lookit those nice trucks! Whats the reach on the boom truck?