Well I've got the perfect thing for you. My Texturepack Test world includes a massive showroom filled with displays for every single block and item in the game. No only that but it also includes a "Zoo" for every hostile and friendly creature in our beautiful, blocky world.
Not enough you say? Well of course not! It also includes an Art gallery which shows off every hand crafted painting in your texture pack as well as an "ore wall" which shows off all of your ore blocks in a natural, smooth stone setting to see how natural it looks. Also included is a rainbow wool wall!
Still not enough? Well its a good thing for you there's more. It also includes a bunker filled with nearly limitless stacks of every item and block in the game which you can use on the large, flat world above to build or test to your hearts desire! There is also an Enchanting and Brewing station which includes stacks of armor and weapons of every type for you to test multiple enchants on, as well as chests full of every alchemical ingredient as well as multiple brewing stands.
Last, but not least.The level of your character has also been raised to level 99,999 for you to test out as many enchantments as you could possibly hope for!
Planet Minecraft Link
Added Mob Eggs
Added New egg and crystal for display.
Re-organized a bit to have a more compact and nicer design.
Added a new wing which includes an efficient enchanting table to get the highest enchants, as well as an alchemy station filled with tons of brewing stands, all the alchemy ingredients, empty chests for storage, and a chest with weapons and armor to use at the enchanting table.
I also raised the player level to 99,999 so you can now test out all the enchants you could possibly want!