What are your favorite unconventional decor items?

This fish was hand carved out of a moose antler. I saw it in a store in Anchorage when I was there for a friend's wedding. It was the first original art I ever bought and was pretty expensive at the time.

A while back, I was a big fan of the lemonade flavored Trulys (alcoholic seltzer). I started stacking empty cans on my desk, letting them accumulate for a couple days, until eventually the desk would get bumped and the tower would fall.
After a while, I started hot gluing the cans together.
Long story short, I have a five layer pyramid of lemonade Trulys atop the shelving unit in the front room. I forget it's there, but people usually ask about it within the first 15 minutes of coming over for the first time.

Functional decor is my personal favorite. I usually have my guitars hung up (just moved, not up in the new house yet). I tried to convince my wife to let me buy two giant googly eyes and set up our central vacuum tube as a mustache, but she didn't go for it (I don't blame her, just a tad sad).

I have a bunch of origami tesselations stuck on my window. They're made with translucent paper (similar texture to tracing paper, but lighter), so they catch the light beautifully
- could you share a picture?

Lots of little tools. Various kinds of pliers, drivers, cutters, magnifiers, lights, and a couple of marlin spikes for good measure. Also, a ruler, a tape measure, and a caliper, for even better measure.

Someone I once knew had a few traffic cones they had snatched of the street and put lights in into their living room, as kind of a decorative lamp. Apparently the walls of those cones are thin enough light comes through and the whole thing glowed. Looked pretty cool.

I used to have a fairly large collection of skulls that I'd found while walking around in the woods.
Not sure what ever happened to them... Probably lost them in one of my many moves.
- Lost: large collection of skulls.
  Reward.