All 3D blocks are bugged because the texture is purple and black in 14w25a than 14w21a/b in ressource packs!
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I made a very public post on Reddit explaining that the block model format was going to be changing. Go get ahold of the authors of the models and tell them to update, this isn't a bug.

Can someone post a link to this article? I would like to update my texture pack, but am not familiar with reddit

I'm interested in that article too, please share a link
For the people wondering about the link to the post regarding the block model format changing, here it is: http://www.reddit.com/r/Minecraft/comments/22vu5w/upcoming_changes_to_the_block_model_system/

Here is the description for the block model format: http://minecraft-de.gamepedia.com/Mcmeta_Format#Block-Modelle (on the German Wiki, the English Wiki hasn't a page on that yet)

Ugh, this is gibberish to me (I'm not a coder, tried that once...); how is the block model change affecting the item textures? I have translated the German article and read the reference link bringing me to Dinnerbone's reddit page thing. Confusing stuff; I just would like to know how to fix the textures of the items.

insomniac_lemon has a pretty good explenation of how to convert models from the old format to the new:
http://www.minecraftforum.net/forums/mapping-and-modding/resource-packs/resource-pack-discussion/1256334-vanilla-model-tutorial
Just click the "basic conversion guide" button at the top of the opening post. It is a little complicated, but I'm not sure there's any way to make it less so.

Thank you, Kyle Cuthbert. I read the link, but have had no luck. I will see if I can address this further, but I do thank you for helping. 🙂