See if you can guess!

After reading the brilliant chapter of The Hobbit "Riddles in the Dark" (great dialogue between Gollum and Bilbo Baggins), members of the Her Majesty the Fantasy club composed their own riddles. See if you can guess:

WHAT IS IT? 

Everyone on earth has it.

It can be colorful.

It can be every size, it depends.

Mostly one can see it with an everywhere-flying string!

- Marek’s riddle

It lives, but not talks.

It grows, but only one part of it moves.

It can’t hear, can’t eat, can’t smell or touch,

but can drink.

It’s home of birds.

- Julia’s riddle

All people have it,

You can’t smell it,

You can’t touch it;

It’s black as night,

And during your dream horrible it laughs…

You see it sometimes.

- Emilka’s riddle