Thin hair woes?

I've decided to stop trying to fight the forces of nature- I have thin, pencil straight hair that couldn't hold curl if it's life depended on it. I'm sick of having bad hair days because I've spent so much time fighting an uphill battle trying to make my hair something it's not. I have longer, dark brown, pin-straight fine hair. Does anyone know any great styling tips for hair like mine? Any good products that I can buy at a place like Walmart? I wash my hair everyday (or else I can't wear it down..it gets greasy and crooked fast!) and I blow dry with mousse. I just want something that will work WITH my hair instead of against so I can be proud of what I got!