A custom terrain painter:
create custom terrain in no time!

MCEdit install info:
1. Download schematic
2. Go to mcedit and open the schematic in your world
3. Go to coordinates 0, 0, 0 and find the redstone block in the corner of the machine
4. Place the redstone block at 0, 0, 0
5. Go to your world and search for the machine (You can type in: /tp @p 0 10 0)
6. press the button
7. If 0, 0, 0 isn't in your spawn chunks or you have no idea what spawn chunks are, type: /setworldspawn

Info:
1. First place some blocks on the chissled quartz blocks, this are your brushes.
2. Select one of your made brushes with the book
3. Put the Draw or Place mode carrot on a stick in your offhand
4. Click to use item, click again when using draw mode to stop drawing.
    Draw mode keeps painting
    Place mode places paint only once
5. You can edit the commandblocks as well
6. You can turn stack mode on or off with the paint book
7. Stack mode stacks the brush automaticcaly
8. Use Place brush to place it as a block
9. With the book you can toggle visibility of armorstands
10. With the paint book you can give yourself the draw mode, place mode, and placebrush armorstand.
11. In the book there are location options, so you when your building you can quickly edit your brushes/commands and go back:
    Remove locations: removes all locations
    Set location: set a location, so you can teleport back later
    Go to location: teleports you to the nearest location
    Go to machine: go to the machine so you can edit the brushes/commandblocks
12. You can edit the time in a command block. (high number->longer time) This is useful if you're using larger brushes. With a             longer time you have to wait before it places the brush. I added this so you don't get stuck in the blocks you just placed.

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If you have questions or suggestions/ideas, put them in the comments below! 

Enjoy!