It will be lumber
About a month ago, on the road where I live, there was a pile of cut logs by the side of the road: the local road crews leave piles of branches and/or logs when they cut down trees that are in danger of interfering with the power lines, and a few days later they come by with the chippers and pick up the branches.
So, I saved two of the larger pieces. I didn't have time immediately to split them into blanks -- to prevent them from cracking while they dried. So, I stuck them in my kids' wading pool.
A few weekends later, I split one of the logs into blanks -- each about 1/8 of the circle. And two weekends after that -- which was last weekend -- I split the other one.
Here's what they look like at the moment (I need to find a better place than "on the edge of the kids' trampoline"):
I realize that at the moment it's indistinguishable from firewood. But in a few years the moisture content will have reached equilibrium -- and then I can saw it to my desired thickness, handplane it smooth, and make something useful out of it -- probably some sort of storage box.
Something more useful -- and interesting -- than the mulch that it would have otherwise become. ;)