Modex Creative is bootstrap portfolio theme that is available free for download. This can be used for personal portfolio, agency portfolio, photographers, artists etc.
We have used http://tympanus.net/codrops/2014/12/23/sliding-header-layout/ for this. The idea is to initially show a fullscreen image with a title and a toggle button that allows to change the view to a grid. The header with the fullscreen image animates upwards and reveals a grid of image anchors with a title.
This theme is licensed under Creative Common License. You can download these themes for free and used it for personal or commercial use.
Share — copy and redistribute the material in any medium or format
Adapt — remix, transform, and build upon the material for any purpose, even commercially.