diff -up dwm-5.2-original/config.def.h dwm-5.2-modified/config.def.h
--- dwm-5.2-original/config.def.h	2008-09-09 21:46:17.000000000 +0200
+++ dwm-5.2-modified/config.def.h	2008-10-20 20:07:42.000000000 +0200
@@ -28,11 +28,13 @@ static Rule rules[] = {
 static float mfact      = 0.55; /* factor of master area size [0.05..0.95] */
 static Bool resizehints = True; /* False means respect size hints in tiled resizals */
 
+#include "gaplessgrid.c"
 static Layout layouts[] = {
 	/* symbol     arrange function */
 	{ "[]=",      tile },    /* first entry is default */
 	{ "><>",      NULL },    /* no layout function means floating behavior */
 	{ "[M]",      monocle },
+	{ "###",      gaplessgrid },
 };
 
 /* key definitions */
diff -up dwm-5.2-original/gaplessgrid.c dwm-5.2-modified/gaplessgrid.c
--- /dev/null	2008-10-20 20:09:51.000000000 +0200
+++ dwm-5.2-modified/gaplessgrid.c	2008-10-20 20:06:59.000000000 +0200
@@ -0,0 +1,38 @@
+void
+gaplessgrid() {
+	unsigned int n, cols, rows, cn, rn, i, cx, cy, cw, ch;
+	Client *c;
+
+	for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next))
+		n++;
+	if(n == 0)
+		return;
+
+	/* grid dimensions */
+	for(cols = 0; cols <= n/2; cols++)
+		if(cols*cols >= n)
+			break;
+	if(n == 5)		/* set layout against the general calculation: not 1:2:2, but 2:3 */
+		cols = 2;
+	rows = n/cols;
+
+	/* window geometries (cell height/width/x/y) */
+	cw = ww / (cols ? cols : 1);
+	cn = 0; 			/* current column number */
+	rn = 0; 			/* current row number */
+	for(i = 0, c = nexttiled(clients); c; c = nexttiled(c->next)) {
+		if(i/rows+1 > cols-n%cols)
+			rows = n/cols+1;
+		ch = wh / (rows ? rows : 1);
+		cx = wx + cn*cw;
+		cy = wy + rn*ch;
+		resize(c, cx, cy, cw - 2 * c->bw, ch - 2 * c->bw, False);
+		
+		i++;
+		rn++;
+		if(rn >= rows) { 	/* jump to the next column */
+			rn = 0;
+			cn++;
+		}
+	}
+}