Here is sciencecraft, since clearly science is awesome, as it brought us Minecraft. Sciencecraft isn't done yet but it's pretty good so far.
So here is sciencecraft, here are some of it's features!

Some terrain changes:

-Netherbrick is metal like (Shown in image of the nether)
-Netherrack is broken metal
-Soulsand is debris
-Dirt texture has been changed
-Sand texture changed
-Stone texture darkened
-Bedrock looks like black brickish type texture
-Chests are metal
-Ladders are metal
-Wooden door looks like an office type door
-Iron door is safe vault door/blast door type thing
-Oak wood is darker with a different texture
-Torch is an electrical light
-Redstone torch is a power box type thing
-Glowstone is a fluroscent ceiling light
-Lever has metal handle
-Trapdoor is metal

Mob/player changes
-Player looks like scientist by default
-Zombie looks like a scientist

GUI Changes:

Some minor tweaks

Item changes:

Coming soon!

Armor changes-
Iron is a security guard uniform with bullet proof vest.