So I have been getting bored of Minecraft but felt like having a twist on my own new single player survival world.
So last week I started out in Minecraft 1.5.2, which was the version I started playing on, and I intend to slowly upgrade the world, along the way collecting mobs, blocks, items and world generation not possible in later versions (dubbed Discontinued Items).
My latest endeavour was actually switching to the 2013 April Fools version, Minecraft 2.0, and obtaining things like enchanted signs, creating setups for floating blocks (ladders, torches, floating sand/gravel, etc.), things that will survive the upgrade to 1.6.