What kind of little touches to do you put into your Fantasy campaigns?
I often draw pictures of the magic items that the player characters under my GMing receive, as well as illustrations of the magic glyphs used by npc casters, particularly if it's a piece of the environment, like a room whose floor is one huge necromancy circle.
I also sometimes make unusual calendars and number systems. For example, the calendar I'm using now is a 10-month year, each month having 3 weeks of 10 days each. The number system I'm using is base-6, consisting of a simple line pattern which is rotated clockwise to count.