I am the exact opposite of most writers, I create the title of book/poem/song/story before I write anything; this helps me understand what I am writing, and what feel I want the book to have. A title is kind of one of the most important things a book can have since it is the first thing (aside from the cover) that people see when buying a book. If the reader doesn't think the title is suitable for their reading needs, it is very slim that they will read the back over or first page.
When creating a title for your whatever, think hard about it, and if you don't like it later on you can always change it. Anyway, most of my 'title inspiration' comes from quotes or songs. What I suggest you do is look up quotes (sad quotes, happy quotes, life quotes, love quotes, etc.) or find song that goes with your book, and once you find one, take the idea of the quote/song and make it into your title. I can even be just simple song lyric or the first line in a quote, doesn't matter as long as it inspires you to write.
Titles can be about anything you want, and if you find the right title, you will be happy and the reader will want to read your book.
this is where i ramble; have fun