Example from Han Boetes.

examples/h-boetes.conf

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+set -g default-command zsh
+set -g status-right "#(uptime|awk '{print $11}') #(date)"
+
+# Statusbar properties.
+set -g display-time 3000
+set -g status-bg black
+set -g status-fg cyan
+set-window-option -g window-status-current-attr bright,reverse
+set-window-option -g window-status-current-bg cyan
+set-window-option -g window-status-current-fg black
+
+# Use c-t instead of c-b as the prefix
+unbind C-b
+set -g prefix C-t
+bind C-t send-prefix
+bind t send-prefix
+
+# Bind function keys.
+bind -n F1 select-window -t 1
+bind -n F2 select-window -t 2
+bind -n F3 select-window -t 3
+bind -n F4 select-window -t 4
+bind -n F5 select-window -t 5
+bind -n F6 select-window -t 6
+bind -n F7 select-window -t 7
+bind -n F8 select-window -t 8
+
+# All new windows started at startup.
+new emacs
+neww irssi
+neww mutt
+neww
+neww
+neww
+neww
+neww
+
+select-window -t 1