1) Meditation on the Gospel narratives of Christ's Passion.
2) Spiritual reading of books like Goodier's Passion and Death of Our Lord Jesus Christ, Abbot Marmion's The Way of the Cross, Edward Leen's Why the Cross?, Fulton Sheen's Seven Words on the Cross.
3) Recitation of prayers like Soul of Christ Sanctify Me.
4) Besides making the daily Way of the Cross, encouraging others to make the Stations at least on Fridays during Lent.
5) Having some symbol of Christ's Passion, like the crucifix or picture of the crucifix within easy eye vision to remind us of the Passion at odd moments of the day.
6) Having some short aspiration which is recited (at least mentally) a few times during the day, like, "My Jesus Crucified," or "Heart of Jesus, obedient unto death, have mercy on us."
7) Occasionally reciting the Litany of the Precious Blood.
8) Spending some extra time before the Blessed Sacrament, asking Our Lord to grow in the understanding of His continued Passion now in the Church, which is His Mystical Body on earth!
9) Making an occasional entry into one's spiritual journal about, "How much the Passion of Christ means to me."
I also must suggest a reading program I found that is set up so that participants, after the 40 days of Lent, will have read 10 Church Father's writings. See their site for more information (pdf).