The White Wizard. His staff is metallic and holds a large white crystal at its tip.
Head of the White Council and most powerful Istar. His staff is taken after his defeat by the ents and the Fall of the Orthanc. After the battle of Bywater he is murdered by his servent Grima Wormtonge and returns the Halls of the Valar to answer for his sins.
The Grey Wizard. His staff is wooden with a transperant crystal at its tip that can be illuminated upon command.
Gandalf the Grey perishes in the Mines of Moria at the hands of the balrog, Durin's Bane. His death is stopped by Eru Illuvatar himself and he returns to Middle Earth as Gandalf the White to replace Saruman. After the War of the Ring, he leaves Middle Earth on a ship from the Grey Havens.
The Brown Wizard. His staff is wooden with a carved eagle at its tip.
Radagast does not participate in the war of the ring, only going as far as to notifiy the eagles of Gandalf's plight at the hands of Saruman. He is known to reside within the forest Mirkwood and eventually declines into the West.
The Blue Wizard. His staff is wooden and its tip branches out like a tree.
Alatar, the First Blue Istar, was the third most powerful of the five. He traveled into the east and was successful in taking out Sauron's forces from afar. He eventually declines and travels into the West.
The Blue Wizard. His staff is wooden and curved at the tip like a hood around a spherical blue crystal.
The least of the Istar, little is known about Pallando. He traveled to the east with Alatar and was successful in keeping Sauron from gaining a foothold. It is presumed he joined the other Istari in the West after the end of the Third Age.