I chose to use birch bark, my favorite tinder. I never got a chance to get out of the city to do this, so I just had to take a few meager scraps from the one in my yard.
I dumped everything, including my kindling in a puddle (doesn't really show up too well cause it's on top of ice, but I fully submerged everything)
Shook off the excess water, scrapped up some of the bark into fluff, and in this case had to cut slits in the non scrapped part for more surface area because it was so wet. A few tries with the firesteel and we have lift off. The kindling was soaked too, and I didn't have enough bark to dry it out and get it going, not without harming my tree at least

(but this is about tinder right?)
Birch bark is like fatwood, but a lot easier to harvest. In the wild (my wild at least) there's dead birch all over the place and you can get a nice big roll of it in 2 shakes. The dead trees are like hollow tubes of tinder because the wood rots away and the bark practically lasts for ever because its so saturated with oils, and it's pretty much waterproof, which is why it makes such a great tinder under any conditions (and was used for hulls of canoes).
I prefer birch bark to fatwood for a number of reasons (not a knock on fatwood though, I love that stuff too

). The white trees stick out like sore thumbs, you basically can't take 10 steps without finding some, you can harvest it in the time it takes to open an envelope, and it needs practically no prep, in dry conditions I've cast my firesteel right on the broad side of a log and the bark started burning off it. IMO all this makes it an excellent emergency tinder, if you're soaking wet and don't have a proper fire kit, you probably don't want to go hunting for fatwood stumps then digging them up & breaking them down.
p.s. Awesome contest, I really enjoyed having an excuse to play around some:thumbup: