One of my favorite things about MixCraft is the sun.
I'm especially proud of the new torches. I replaced them with small landscaping lights. In order to preserve the illusion, I had to edit the particles file and remove the flame and smoke. It's not perfect, but everything looks much neater, more civilized.
Same for redstone torches.
Obsidian. More sleek, black, and monolithic. I'm not 100% happy, but I like it well enough. It's less hideous as a building material to compensate for the effort necessary to acquire it.
Ice. The original ice looked too much like pixel art in comparison to the more realistic textures. This was adapted from a photo, but like Obsidian, it's not perfect.

The diamond sword in MixCraft is a lightsaber. I turned it into an actual sword, sword of katana-like.

New lever. No screenshots of it in action, so I don't know how it really looks.

I tried making a new version of flint and steel that doesn't look ugly. Unfortunately, it's held sideways (pointing 90º to the left) so it doesn't look like a gun. I'll have to come up with an alternative.