I am making a completely random texture pack where everything gold looks like obsidian and everything obsidian looks like gold. There are many more additions such as

• Bows and arrows are blue.
  
• Pigs are mutated.
  
• The default skin is sort of a bug.
  
• On two of the pictures there are bugs.
  
• Torches are energy efficient lightbulbs.
  
• Glowstone is a box with an energy efficient lightbulb in it.
  
• Snow is fire.
  
• Snowballs are fireballs.
  
• Netherrack has a bug's face on it.
  
• Dispensers have a bug's face on it.
  
• Furnaces have a bug's face on it.
  
• When you dig, it will shape into a face.
  
• It rains bombs.
  
• A sponge looks like a curled up sponge person.
  
• An enchanting table is also gold.
  
• TNT looks like a big blue bomb.
  
• End stone and the end portal have the word end on it and a bug face.
  
• Bedrock has a random black and red thing on it.
  
• Creepers have blue lightning scars on them.
  
• Chickens look like floating creepers.
  
• Eggs have an evil face on it.
  
• The enderdragon has a smile face (not tested yet).
  
• Boats are green and have eyes on them.
  
• Redstone lamps have eyes on them.
  

I'm still not done with it. Please comment to tell me what I should add or improve. I have just added the picture and words in the texture pack menu.