Recipe Packs can be purchased in the Store with Coins that can be bought with real money. Store-bought recipes are available on all Creativerse worlds (will always "carry over") after being bought once. Additional to the crafting recipe you now can claim one item kit (that includes a number of examples of all blocks and/or items from the pack) on one Creativerse world of your choice. So once you've claimed the kit in one world it will not be available again on other worlds.