From Morgan Joeck
One thing that bothered me when I first started gaming was identifying the spell I was casting when those around me would not have known what it was.
My solution to that was to print out colorful fractals or other designs on index cards and fold them into little envelopes containing the spell name and other information the GM needed inside each one.
Creating one envelope for each spell allowed me a simple way of knowing which spells I had prepared for the day and how many castings of each I had left.
I also thought it would make sense for the other players to learn something as we all adventured together.
Therefore, I used the same design each time I prepared a given spell and tried to coordinate the main colors of the design with the type of spell.