Traditional Catholic rosaries are widely available, with many kinds of beads, medals, and crosses. It is perfectly acceptable to pray the rosary in any way you wish. Although the rosary practice has stabilized into a particular form, a quick glance at any history of prayer beads will reveal how the practice has changed through time. Darel E. Paul developed a Lutheran approach to praying the rosary. His copyrighted practice may be downloaded here. Experiment and see how this affects you. And feel free to improvise!