radpat = cairo_pattern_create_radial (0.25, 0.25, 0.1,  0.5, 0.5, 0.5);
cairo_pattern_add_color_stop_rgb (radpat, 0,  1.0, 0.8, 0.8);
cairo_pattern_add_color_stop_rgb (radpat, 1,  0.9, 0.0, 0.0);

for (i=1; i<10; i++)
    for (j=1; j<10; j++)
        cairo_rectangle (cr, i/10.0 - 0.04, j/10.0 - 0.04, 0.08, 0.08);

cairo_set_source (cr, radpat);
cairo_fill (cr);