The point of this game is simple, someone "makes up their own" riddle, and everyone else has to guess the object/thing/person/etc. that the riddle is supposed to be describing...

I'll start off w/a simple one, well...hopefully simple :D

I am something that is found in all homes
I am something that is found in most rooms
I am something that moves up and down
sometimes side to side, in or out
and you can see right through me when the rain pours down

What am I?