Like the title says.  Items of Power can be more than Refresh rebates for your characters - they can be sources of really great thematics.  Share!

My offering: The Gallows Eye (for a pirate-themed game) (-2 to -3)
A carved wooden false eye, worn smooth, with a twisted grain running throughout.  This eye was carved from a used gallows tree, upon which the character's trusted captain had been hung.  Now, the character wears the eye as a macabre memorial... and to make use of the spirit-sight it grants.


It Is What It Is: A false eye.  Thus, in order to make use of the Gallows Eye, a character must lose an eye and place the Gallows Eye in its stead.  The eye does not grant standard binocular vision - it is, after all, a false eye - and thus the Aspect associated with this Item will be compelled quite often for situations requiring depth perception.  
Unbreakable: The Gallows Eye cannot be destroyed save by the use of a necromantic ritual similar to a ghost-binding or the Darkhallow.  
Imparted Abilities:
One-Time Discount [+1]
Ghost Speaker [-1]
The Sight with a leaning toward death, ghosts, and spirits [-1]
Spirit Sensitivity (as the Stunt Finely-Tuned Third Eye) [-1]
Psychometry [-1] can also be added, at sight rather than touch.

A lot of these would depend on what the critter in question is - an obvious earth elemental?  Gonna be very easy to figure out that if you separate it from Mother Earth it'll lose its power.  John HumanGuise who happens to be a scion of Gaea?  less obvious.

Debt tracks only come into play (if I understand it right) if you want to allow the player to invoke aspects without spending FPs.  I don't, really - I want the power to have a tangible cost when used, to keep it from being a "let's clear out everyone's consequences after every battle"

Sorta depends on the playgroup, but I prefer to see 'em flowing like water, on both sides of the table.  Keeps the story interesting, with a lot of fancy Compels, and gives the players the moxy they need when they need to bust it out.

'sides, Compels are just fun!

I kill a white court vampire with magic.  Am I subject to temporal enforcement of the Laws by the Wardens?  No, because it's not Human.  The Accords, however, probably have things to say about it. 

Am I subject to the soul-twisting effects of the metaphysical Laws?  That's harder to say; if I recall the book right, it says "you are if it makes for a good story." 

In a game *I* was running... I'd say that white court virgins, red court infected, and maybe even full white courtiers would hit you with Lawbreaker if you killed 'em with magic.  They're all noted as mostly-human in many ways in the books.  I'd say that the cutoff is "does it have a soul."  We know from Thomas that Whampires have souls separate (if mingled) with their demons, so I'd rule that Lawbreaker applies.

there are also sites out there that'll let you search for nearby gamers.  a quick Google search can sometimes lead you to a gaming table within 5 miles you'd never known was there.

::shrug:: call it a power, if you must.  I just called it a Stunt because it isn't really magical itself, it's just a sign of special training and experience.  Stunt or power doesn't make to much of a difference, once you've already got powers.