This feels way too broad.
(Also, hints are not patches on broken puzzles - if the puzzle is too broad, change it, don't add hints!)
Another possible answer:
Diamond
I can have many shapes and sizes
Diamonds come in many sizes and cuts
I can have many styles and alter people's mood
Again, different styles. Giving someone a diamond ring can drastically change their mood. :)
I am used in a famous game
Among many others, Poker is a famous game. Diamonds are involved.
I am in many movies
Yup
Hint 1 (Trying to make it less broad):
Some objects can be made of me
Many cutting tools are made of diamond
Yet another possibility:
A ring
Rings come in different sizes, shapes and styles. Rings given as gifts, or in particular engagement rings, are definitely mood altering. Rings are used in a famous game, and appear in a lot of movies (Hobbit / LoTR movies alone qualify as "many movies"). And chains and ring mail armor, among a lot of other things, are made of rings.
You need to further define your puzzle. It is far too broad, and will likely be closed soon.