(NOTE: This is my first mod so sorry if it isn't anything big or has some bugs in it...)
Have you ever wanted (I don't know why you would want this) the mysterious Missing Texture as a block so you could use it as a decoration? Well want no more, because I have created a really simple mod that only adds in five blocks: the Missing Texture Blocks from all versions. They can be crafted and can be broken by hand. They do not emit a light level, are not transparent, and are not affected by gravity. They cannot be smelted or used as fuel. That basically wraps up the mod. I do not believe it will work on any other versions other than 1.9 and 1.9.4.
Usage in Modpacks
Why you would ever need this in a modpack is beyond me. You may use it in anything if you give me credit and include the following: "Missing Block Texture mod created by maestro26801" or along the lines of that. All I ask is if you don't copy this, post it somewhere else and claim it to be your creation.
Link to Mod
Missing Texture Block Mod 1.0.0 for 1.9
Missing Texture Block Mod 1.0.0 for 1.9.4
Missing Texture Block Mod 1.1.0 for 1.9.4
Link to Forum Post
Missing Texture Block Mod Forum Post
Update for 1.9.4
I have just recently updated this mod to 1.9.4 so you can now use it in 1.9.4 worlds!
Update 7/3/16: Version 1.1.0
I now have included all of the textures of the Missing Texture from all versions so you are not just stuck with the current black and magenta Missing Texture Block!