Hi there,
you can include classes and inline styles to the LGC grid. Check the FAQ here and it shows you how to do that:
https://en-gb.wordpress.org/plugins/lightweight-grid-columns/
I personally would use CSS classes e.g add this CSS:
.column-bg {
background-size: cover;
background-position: center center;
}
.column-bg.first {
bacgkround-image: url(image_url_for_first_column);
}
.column-bg.second {
bacgkround-image: url(image_url_for_second_column);
}
/* add more column-bg.column# */
Then your first column would contain class="column-bg first"
second column class="column-bg second"
and so on