There are some quest rewards which give an item which produces a fun effect when used. Most are from the public dungeons but a few are from normal quests. Some of the effects are visible to others, others only to you…
The items I have found so far are (links for further information below gallery):
Almalexia’s Enchanted Lantern
Bonesnap Binding Stone
Discourse Amaranthine
Fetish of Anger
Finvir’s Whistle
Glanir’s Smoke Bomb
Justal’s Falcon
Mezha-Dro’s Sealing Amulet
Nanwen’s Sword
Nirnroot Wine (also get the chiming sound of Nirnroot)
Questionable Meat Sack
Sanguine’s Goblet
Token of Root Sunder
Yokudan Totem
- Almalexia’s Enchanted Lantern (Mournhold, Deshaan quest A Favor Returned)
- Battered Bear Trap – Lays a trap on the ground (destroyed it before screenshotting!) (Auridon: The Toothmaul Ploy, quest starter inside Toothmaul Gully)
- Blackfeather Court Whistle (Stonefalls: ‘Decree of the Court’, quest starter inside Crow’s Woods).
- Bonesnap Binding Stone (Stormhaven: Repairing the Cage, quest starter inside Bonesnap Ruins)
- Discourse Amaranthine (Reaper’s Marsh: The waking dreamer, quest starter inside The Vile Manse)
- Fetish of Anger (Rivenspire: Foul deeds in the deep, quest starter inside the Obsidian Scar)
- Finvir’s Trinket (Glenumbra; ‘Can’t take it with them’, quest starter inside Bad Man’s Hollows)
- Glanir’s Smoke bomb (Malabal Tor: Naval Intelligence, quest starter inside Crimson Cove)
- Justal’s Falcon (The Rift: A Valuable Distraction, quest starter inside The Lion’s Den)
- Lena’s Wand of Finding. Strike a critter with lightning. (Shad Astula, Deshaan quest Vision Quest)
- Lodorr’s Crown (Eastmarch: The Lost Crown, quest starter inside Halls of the Dead)
- Mezha-Dro’s sealing amulet (Coldharbour: Holes in the World, quest starter inside The Lost Village)
- Nanwen’s sword (Greenshade: The dead king, quest starter within Rulanyil Falls)
- Nirnroot Wine (Cyrodiil: quest from one of the three wineries)
- Questionable Meat Sack (Deshaan quest: A Bitter Pill, quest starter inside Forgotten Crypts)
- Sanguine’s Goblet (Shadowfen: Foreign Vintage, quest starter within Sanguine’s Demesne)
- Token of Root Sunder (Grahtwood: ‘Forgotten Soul’, quest starter inside Root Sunder Ruins)
- Yokudan Totem (Alik’r Desert: Secrets of the Lost City, quest starter inside the Lost City of the Na-Totambu)
StarShadow 
Thank you for the tip. I have received a coupe of these “trophies” and had no idea they could be used. I’ll have to try them out later tonight.
thanks for commenting and glad you found it useful 🙂 I’ll be updating the page as I find them too.
Is the effect only lasting for a bit or does it stay and you can use it any time ?
The effect is short but you can use the item as many times as you like.
Sorry that I’m posting such a random question on a post from two years ago, but what’s the armor in the screenshot with Almalexia’s Lantern? It’s very pretty!
Not a problem at all 🙂 sadly, i think the style may no longer be available. It’s light armour and i think she was VR1 at the time of that screenshot (she was abandoned at that level for ages!) i think it’s Breton style but I’ve just checked on ESO-fashion and i can’t see it 😦 i think they dropped a few styles once the VR levels were removed… If i remember anything else, I’ll update the comment. Sorry!
Thanks a lot for the reply! Oh well, that explains why I’ve never seen it in game. It’s a shame, I like it a lot more than the current Breton styles. I guess my search for the perfect outfit will have to continue 😀