Not cedar

[BowFish]

 

 This log was with some cedar logs. What is it?

[Old Greenhorn]

Rainbow Poplar?

[JohnW]

Catalpa?

[Southside]

Sweet Gum that was allowd to sit for a while.  I make a lot of it, and folks love it.  

[SwampDonkey]

Might even be box elder heart. It's few of that red in the heart up here. Looks like a bunch of fungal stain to, even a spot of dry rot (white spots). I've seen fruiting bodies on them dry rot spots before, wood laying around.

Reminds me of several stories I read about where someone goes and picks up a wooden floor loom. The seller gifts all kinds of wooden pieces along with it. Could be something off a chair or cabinet, they just hate to toss into the firewood bin. The buyer becomes puzzled over what the heck it is and where it fits. Love it. :D :D

[Tacotodd]

Designer firewood :D

[kantuckid]

Catalpa is a light brown/dark tan color. Never seen it color up like that either. 

[JohnW]

Okay, I believe you kantuckid

[firefighter ontheside]

Looks like the trunk of a silver maple.

[Okrafarmer]

Might even be box elder heart. It's few of that red in the heart up here. Looks like a bunch of fungal stain to, even a spot of dry rot (white spots). I've seen fruiting bodies on them dry rot spots before, wood laying around.

SD, the coloring is dead-on correct for the box elder we have here in South Carolina. See the gray areas? Our box elder has those gray, the blood red, and the vanilla cream areas. 
However, the grain and stain shape patterns do not resemble our South Carolina box elder, although it still may be that.
Is the wood clearly a hardwood? you said not cedar, but are you sure it was a broad-leaf tree?
Is it heavy like oak or light like pine and cedar? Box elder is one of the lightest broadleaf trees and it cuts like butter. In most cases, the logs do not have a lot of tension in them even if they are crooked. (In my local experience). P.S. (at this date, at least) see my avatar picture for some of our local box elder.

[SwampDonkey]

I would say the grey is a sap stain, been laying around in log form for a bit.

[Okrafarmer]

I would say the grey is a sap stain, been laying around in log form for a bit.

Makes it better, as long as you catch it before it actually rots to pieces.