Thanks to GK's clarification, I have figured out how to add a texture Mod to total miner, so I have been working on a texture pack for my Pokemon leaf green world, and I will release it once the blocks have all been modified.
Once I finish with the blocks, I will work on the items, then eventually some mobs.
Also, Once I finish all this, and actually finish the builds on that world, I think I will be sharing that out as well (It will not be scripted, or a challenge course though)
EDIT: More progress has been made (About double), and can be seen in the project/group in the post below. I have been making about 10-15 textures a night, and the blocks/items should be done pretty quick.