Responsive images.

This example has 90 cells and a loading spinner.
The grid load is defered of 2 seconds so you can see it.
The cells have absolute positioning percentage width and fixed height.

Check the code

// When DOM is ready.
$('.thegrid').grid(
{
    grid: '.thegrid',
    cells: '.cell',
    cellHeight: 100,
    cellsPerRow: 7,
    animationPlatform: 'js',
    animationSpeed: 1200,
    animationEasing: 'easeOutElastic',
    breakpoints:
    {
        1199:
        {
            cellsPerRow: 5,
            cellHeight: 100
        },
        767:
        {
            cellsPerRow: 4,
            cellHeight: 130
        },
        479:
        {
            cellsPerRow: 2,
            cellHeight: 160
        },
    }
});