I love bootstrap, but i\'m trying to achieve something totally outsides its expected grid, which is to have cells stack under each other without grouped lines. Something like Pi
Looks like you have to use JS to reach goal.
You can use following libs:
Jquery Wookmark - Light weight and fast. Used in myself resolving similar issue
Isotope - Flexible and reach functions one
Mansonry - Popular lib, similar to Isotope