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(Almost) every method that took 3 integers takes an instance of BlockPos. IBlockAccess#getBlock is now IBlockAcces#getBlockState, which should call most methods on that you previously called on the Block instance.

IItemColor#getColorFromItemstack receives two arguments: the ItemStack being rendered and the tint index, which specifies the model part being rendered. You can use both of these to determine which colour should be returned. The tint index is similar to the render pass arguments of colour-related methods in previous versions. For models that extend builtin/generated , each layerN texture has a tint index of N . For other models, you can specify the tint index for each face in the model file (see the wiki for a full specification of the model format). For the singularity, you'd use the ItemStack 's metadata to determine which index of the colour arrays to use and the tint index to determine which of the two arrays to look up the colour in ( colors2 if it's 0, colors if it's 1). Look at the IItemColor of Items.SPAWN_EGG for an example of the colour being chosen based on the ItemStack and the tint index.