you could check my youtube page for all that information but in case you don't want to, ambrosial meat can be dropped by griffons and found in the quarry! the king bay leaf is found in the witch's woods and idols are obtained from fournivals quest and message board quests
For Gameplays, Vlogs, Cooking, and Fun Check My Youtube @ www.youtube.com/user/datgurlvialey
Bronze Idol: Two available per playthrough. The first is sitting around in the Dragonforged's cave. The second is also sitting around on a shelf/windowsill in Selene's Hut in Witchwood.
Silver Idol: One per playthrough. There's a Notice Board quest in the Pawn Guild called "Put the Eye Out". Take it and complete it for the idol.
Gold Idol: One per playthrough. First, complete the quest "Land of Opportunity", given by Fournival. Wait a day or two, then go back to his house and accept the quest, "Escort Duty". Once you complete it, talk to Symone and she will give it to you... provided you cater to her whims sufficiently. Check youtube for a detailed walkthrough.
If you do the "From a Different Sky" quests, keep the badges in storage. When you go through NG+ you can dump them all into your pawn's inventory and instantly complete the quests when you pick them up at the notice board, netting a decent bit of experience and RC for almost no effort.