How to use those textures in game?
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- normaly they are not available in game (including creative mode)
- you will need some external program, mod, or plugin to access those textures

namely:
- Meta Cycler plugin (for Bukkit) (recommended)
- World Edit
- SPC (SinglePlayer Commands) mod

Details on how exactly use those plugins/mods in game should be explained on their websites.

In short:
- each block/item in game has it's ID number
- each ID may have up to 16 metadata values (0-15)
- some blocks already use a range of those values and are being used by default in MC
- the rest of the values is unused = those are the metadata spots that can be occupied by custom textures
- basicaly, each block/item may have up to 16 variations

You can get the metadata textures by replacing an existing block with a new value via command or with specific item (see the plugins/mod guides).

To get a metadata texture provided in this pack you need to know which blocks/items are supported.
Visit the pack's topic at planetminecraft.com or minecraftforum.net where you can find a detailed List of all supported blocks/items.

http://www.planetminecraft.com/texture_pack/ornate-5-re-resurrected-64px/

http://www.minecraftforum.net/forums/mapping-and-modding/resource-packs/2148895-ornate-5-re-resurrected