Something or someone that is good, awesome, wonderful, amazing. (See all other positive synonyms.)

This is used to describe something that's very cool

Used by fans of the TV (short lived) show Firefly, to describe an idea/something that one likes (instead of saying brilliant, awesome, cool, neat, rad...?).

Shiny is used especially if the idea or thing is new or bright. Not used so much to describe old things or things that look old.

something interesting or distracting, generally used when it deverts attention from a task

This usage comes from the phenomenon of birds (particularly crows) being attracted to shiny objects.

Shinies - Slang
Modification of the adjective "Shiny," into a plural noun.

Shinies; see Bling, Treasure, Gold, Jewels.

Any number of valuable items.

a shortened name for the band shiny toy guns

a positive way of describing someone who has ADHD