I found these riddles , can anyone help me figure it out?

[Manwe]

Well, here's one more...

In the dawn I'm small and bright,
bathing in the spring light,
in the noon I'm as the grass green,
and everywhere I'm seen,
by sunset I continue my run,
and change to color of blood or sun,
when the night comes I turn to brown,
and the fall dead down,
what am I?

NOTE:The day-times is metaphorical.