Wow! Some of these are very ornate.
Yes, some are quite intricate and very beautiful. Here is some more information from the Catholic Encyclopedia:
[the crosier is a] symbol of that doctrinal and disciplinary power of bishops in virtue of which they may sustain the weak and faltering, confirm the wavering in faith, and lead back the erring ones into the true fold. Barbosa (Pastoralis Sollicitudinis, etc., Tit. I, ch. v) alluding to the prevalent form of the staff, says that the end is sharp and pointed wherewith to prick and goad the slothful, the middle is straight to signify righteous rule, while the head is bent or crooked in order to draw in and attract souls to the ways of God.
...The volute often terminated in a dragon impaled by a cross, or in some other allegorical figure whilst a wealth of floral decoration filled up the curve. In the thirteenth century the spaces between the spirals of the crocketed volute were filled religious subjects, statues of saints, and scenes from the animal and vegetable kingdoms, while in those of the Gothic form the knob was set in precious stones and embellished with a wreath of allegorical ornamentation...