Answer:
In many hall ways you would stand if not with me in hand.
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain; doing no harm, and feeling no pain. What am I?
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves every day. What am I?
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen. What am I?
I am a key that is playful. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.