3D Art Simulator for Buildings of Minecraft
This page has substantial of applications that can easily convert real images into 3D pixel art, which is useful when building at Minecraft game.
The flat image is then turned into frontal pixel art by adjusting the angle, and then into 3D art by using tools such as layer duplication.
And, the 3D display for confirmation is also available, so you can check the data in a way that is more similar to the real thing.
Finally, you can convert the resulting data into Excel data and download it as blueprint data with the placement of blocks per layer and the number of blocks required.