You can manage :
– Number of columns
– Columns width
– Gutter width
– Grid alignement to left, center or right. Then you can adjust the offset.
– Opacity
The “common grid” preset selector will probably help you to find in one click your favorite grid framework…960.gs, 978.gs, Twitter Bootstrap…
When you leave Grrrid, it records your current grid. Thus you won’t need to re-customize it when you refresh the page.