As a texture pack and map maker and builder myself, it would be incredibly useful to have a texture block that can be accessed similarly to how you get command blocks and structure blocks. Without a texture pack applied, it is just a white block, but if you have a supporting texture pack then the block will have a custom texture. If you apply a different datavalue, we should be able to give it a different texture that could also apply when we place it. I imagine it could work like the custom damage value for tools.

It could work like this: /give @a minecraft:Textureblock 1 {enter a corresponding value} Or possibly even /give @a customtexture:{name of custom block} 1 0