Cybil, I currently live in Corpus Christi, TX. It is often very hot and very humid here.
I am currently constructing a small mushroom growing building and hope to attempt some outdoor, more "natural" installations in the future as well.
The fermented straw method requires no pictures, as they would be pointless. You literally just shake some straw into a container (trying to make sure there are no large clumps) and cover it with water (with no chlorine or chloramine....you can use ascorbic acid to remove the chloramine). When it gets smelly (one to two weeks, depending on the outdoor temp.)--yes, it can get quite smelly, because you are relying on anaerobic bacterias to colonize the straw--then it is ready to use. Drain the water off and innoculate.
I am generally on the Paul Wheaton side of "if it smells, then you are doing it wrong" these days (though I personally think that there can be exceptions to that rule), so it's not my favorite method. BUT it is very easy and has a very low energy input.