Is it ok to pray different prayers in conjunction to one another? I would like to know if it's appropriate to pray different prayers in conjunction with another?

For Example: 


The Litany of Humility
Rosary
Prayer to a specific Saint
bedtime prayer
Insofar as the Catholic Church is concerned on this matter: there is no problem with praying different prayers in conjunction to one another.  I personally know many religious (Benedictine monks mainly) who do this very style of prayer daily.  

Do not have any reservations about this style of prayer. Go ahead and pray the way the Lord inspires you...