I know what you're thinking... So basic, everybody already says this.
But if it's so, there must be a reason.
If you feel like you are a creative person, and you are ready to take your talent to the next level, try some of these ideas:
a) Start a blog. There you can write whatever your heart desires.
b) Or maybe, start writing poetry, a book, or songs. That is what's good about writing, you can literally write anything.
c) The simplest thing you can do is to start writing a journal! What is great about that one is that you can document your life and one day look back and see what you were doing. You can also share your feelings and let your frustrations go on paper.
That is what I use my journal for. I write about my days; my dreams, activities, stresses, goals, and achievements.
Seriously, I highly recommend this one!