Answer:
I have memories, but none of my own. Whatever's on my inside is what is shown. If I'm ever different, it's because you changed me. I feel like a decoration, here for you to arrange me. What am I?
I stand in one place yet I fill a whole room. I can be filled with molten rock and come in every hue.
Who is your mother's only sister's son's brother's aunt's daughter's sister's father?
What is at the end of a rainbow?
I go from house to house a messenger small and tight. Whether it rains or snows I sleep outside at night.
No matter how little or how much you use me, you change me every month.