ibuffer-fontification-alist

ibuffer-fontification-alist is a variable defined in `ibuffer.el'.
Its value is shown below.

Documentation:
An alist describing how to fontify buffers.
Each element should be of the form (PRIORITY FORM FACE), where
PRIORITY is an integer, FORM is an arbitrary form to evaluate in the
buffer, and FACE is the face to use for fontification. If the FORM
evaluates to non-nil, then FACE will be put on the buffer name. The
element with the highest PRIORITY takes precedence.

If you change this variable, you must kill the Ibuffer buffer and
recreate it for the change to take effect.

You can customize this variable.

Value:

((10 buffer-read-only font-lock-constant-face)
 (15
  (and buffer-file-name
       (string-match ibuffer-compressed-file-name-regexp buffer-file-name))
  font-lock-doc-face)
 (20
  (string-match "^*"
		(buffer-name))
  font-lock-keyword-face)
 (25
  (and
   (string-match "^ "
		 (buffer-name))
   (null buffer-file-name))
  italic)
 (30
  (memq major-mode ibuffer-help-buffer-modes)
  font-lock-comment-face)
 (35
  (derived-mode-p 'dired-mode)
  font-lock-function-name-face))