Gooey Mass The main item people seek from this is the (usually) very expensive Four leaf clover .
Belonging of the deceased (You get it by trading in medicine pouches to Ottokar in venore) and it can give you very rarely a Slug Drug as well as a Nose ring .
Surprise Cube can drop various expensive and interesting items like the 5 different versions of the pit demon .
Lots which can give you the four plushies from Orcsoberfest and a rare food Leberkassemmel
Mucus Plug (you have to use a Muck remover to open it) and it can give you items like the crystalline sword,armor and backpack :
Unrealized Dream can give you items like the prison boss keys and a dream warden claw :
Glooth Bag which drops glooth items and probably the best item being the control unit
Surprise Nest and it drops your previously mentioned blue and red bags as well as Phoenix eggs Hydra Eggs and coloured eggs.
Gooey Masses: Found in the Hive behind the green walls by using Insectoid Cells or by looting from Hive Overseerer.
Suspicious Surprise Bag: loot from Undead Jester
Gnomish Supply Package: Obtained by doing Bigfoot's Burden Quest tasks.
Surprise Cubes: There is a chance of obtaining these from Lorenzo after exchanging Arena Badges for potions. The higher the amount of required badges for a certain kind of potions, the higher the chance of getting a surprise cube.
Mysterious Remains: Dropped by various creatures.
Surprise Jars: Rewarded after completing tasks from Dangerous Depths Quest.
Edit: To add more items
Just to add an item the none mention, I'm talking about Costume Bags, these items will transform you into a creature since you use it. There are some variation of it:
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