We should liturgize devotion as far as we can, rather than devotionalize the liturgy as happened in the last several centuries when low Mass became the norm, public practice of devotions replaced the Office, and some odd feasts crept into the kalendar (several Marian apparitions, the Miraculous Medal, Precious Blood, the Sacred Heart etc).
I for one like to adapt the way I pray the Rosary to the season in order to "synch" all my prayers with the time of the year. I do not really use the John Paul II mysteries. On Sundays per annum and of Paschaltide I pray the Glorious Mysteries. Sundays from Advent until, but excluding, Septuagesima I pray the Joyful Mysteries. And during Lent on Sundays the Sorrowful Mysteries. I only use the Fatima prayer during per annum time. During Paschal week or "Bright Week" and during Pentecost I replace it with a triple alleluia. For the rest of Paschaltide I say "Christus Resurrexit, alleluia." During Christmas season it is "Christus natus est." During Lent it is "Miserere mei, Deus." When Passion Sunday comes I eliminate the Gloria Patri. Whenever I pray the Office of the Dead on a given day I will omit the Gloria Patri and the seasonal ending in favor of Requiem aeternam dona.... Another thing to do is to utilize the array of mysteries available during octaves. Monday will be the first time in several weeks that I have not prayed the Glorious Mysteries because I used them through Ascension time and the octave of Pentecost. One should, I think, consider using the Sorrowful Mysteries every day of Holy Week, the Joyful during the Nativity and Epiphany octaves and the like. One last thing I like to do, depending on the time of the year, is to swap the Salve Regina for the seasonal Marian antiphon. Today I used the Regina Coeli for the last time until 2015.
If someone does not want to learn the Office or finds private liturgical prayer difficult, this could be a great way of becoming familiar with the mysteries and feasts of the Church without adjusting one's prayers too much. This sort of variation was very common in the Middle Ages. Salisury, the diocese of the Sarum rite, had a public liturgical Rosary that looks very little like what we use today. Variation is acceptable within reason.
Again, let us liturgize our devotion so we do not devotionalize our liturgy.