Use AW.Templates.ImageText or AW.Templates.Image for the image columns
grid.setCellTemplate(new AW.Templates.ImageText, 1)
Use setCellImage(imageArray), setCellImage(function) or setCellImage(image, col, row) methods
grid.setCellImage(imageArray); // 2d array
grid.setCellImage(function(col, row){return ...}); // function
grid.setCellImage("ok", 1, 1); // single cell
Back to image examples, all examples