[quote="Xandria, post:14, topic:252037"]
I was thinking along the lines of popular devotions that were once widely practiced but have now fallen into disuse, at least where I live. But again, I don't know if the encyclicals are necessarily good for that.
There have been encyclicals written to foster or encourage devotions in certain times in history. You might be interested in reading some of them.
There are encyclicals on St. Joseph, the Blessed Mother, the Rosary, the Sacred Heart of Jesus, etc..
I sometimes go through a list of encyclicals online and see what attracts me. Papalencyclicals.net is a very good site because the Latin titles of the encyclicals are translated into English so that you can scan the titles easily.
I read Pope Leo XIII's encyclical on the Holy Spirit where I found some really good prayer starters for prayers to the Holy Spirit. (Divinum Illud Munus - On the Holy Spirit Divinum)
I've learned a lot from reading encyclicals, but they have to be read in historical context and their language can be hard to understand -- Pope Leo's sentences are long!
Some encyclicals recommend or put into practice certain prayers to be said after Mass -- BUT that was at that time, not now. (I'm not sure if those devotions were temporary, sort of like how our parish said a prayer for priests before Mass during the Year of the Priest.)
Otherwise, a book on Catholic devotions might be what you're looking for. This one is very simple:
The How-to Book of Catholic Devotions
by Mike Aquilina and Regis J. Flaherty from Our Sunday Visitor (ISBN: 0-87973-415-9)
I hope this helps.