Provides two minor modes highlight-indentation-mode and highlight-indentation-current-column-mode

• highlight-indentation-mode displays guidelines indentation (space indentation only).
• highlight-indentation-current-column-mode displays guidelines for the current-point indentation (space indentation only).

Appearance of guidelines is customizable by changing the face highlight-indentation-face and highlight-indentation-current-column-face.

Example, colors from screenshot:

(set-face-background 'highlight-indentation-face "#e3e3d3")
(set-face-background 'highlight-indentation-current-column-face "#c3b3b3")

To enable experimental support for showing indent guides on blank lines, set highlight-indentation-blank-lines to t.