Grainyflex is WordPress theme that is packed with many great features. Such as custom header, custom background, configurable social links at the bottom and best of all it is completely free. Below you can check some screenshots and additional stuff such as theme headers in PSD format including Photoshop styles which you can use to make your own header.
Theme is based on _s theme as a starting point but I have built huge amount of stuff on top of it. So besides all of the features that it includes theme is fully responsive and behave very good on all types of devices