One of the things that made enchanting your cities in master of magic quite rewarding, was that every spell had a graphical representation on the city view. This could also be added to Elemental.

E.g., a city with a farm that has been enchanted by "Enchant Farm" could show some kind of sparkle on the farm tiles with in the city.

In the same manner studies and schools could sparkle (or somethin more elaborate) when the city was enchanted with "Brilliance".

The list goes on with enchant production (Workshops) and finally enchant defense. Here a wall of fire spell could visibly drawn instead of the wooden palisade (or stonewall later on).

Adding soem sparkles should not be to difficult and would make casting citie spells much more rewarding. Its often small details like that, which make a good game great.

I remember having played several games of MoM with Death and Fire magic only for the one reason: to enchant my cities with wall of darkness AND wall of fire, which was really great looking at the time. The same with the holy light enchantment that put those rays of light into the city. Great times.