I think it would be really awesome if you put in these features-

Allow 2 different sizes of blocks for every texture in the game.
Regular (current) and a smaller block 1/4 the size of the regular block (would take 27 small blocks to make a regular block, like a cube divided into nine parts on each side).

As well as make different shapes.
A half square, a variety of triangles, circle, ball, polygon, hexagon, trapezoid, rhombus, pyramid, and cylinder.

And at last allow the players to rotate individual blocks from vertical to horizontal etc.

This would offer scale and realism to Minecraft that you can't have otherwise.
Thanks for reading. Pass this along and post a comment if you agree.
-A fan.