I look away for a few hours, and my nefarious influence has caused cavorting hooliganism?? I shall rectify the situation with an on-topic post about my idea du juor... This may be too complicated for little gain, but I'll throw it out anyway.
Battles are much more interesting than fighting, of course. On some games with friendly rulers, many turns could go by in the middle of the game, after settling before anything "interesting" happens. Part of this is the animation, and trying out the great units. But I wondered if there was some way to impart a bit of suspense to building? Without of course diminishing the strategic choices.
What if buildings could occasionally be built better than normal? It might give more suspense than 'what will I build next?' I thought about having a 'great' and a 'masterful' version of ordinary buildings, say, 10% of the time your oblisk will be great and cost no gold, 5% it will give +4 culture rather than +3. But I realized that this would probably entail having 3x as many buildings in, or complicated coding changes, both of which would slow down playing/loading.
Instead, a small percentage of the time, say 10%, I building would be built with an "addition" which in reality would be a separate building in the city, but one unable to be otherwise constructed. Only one "addition" would be possible with each building built, and of course none with units. A message would pop up reading "Our citizens completed the Obelisk ahead of schedule! A _______ was added!" With the blank being one of a few buildings with small bonuses:
A fountian; +1 health
A statue; +1 culture
A guard station; +5% defense
A garden; +1 happy
A market stall; +1 commerce
A ? (arena?); +1 XP
Not too many, as most cities would only get two or three in the game (about one for every 10 buildings built.) These wouldn't even need art, really. Should it be possible to get two of the same? Is it possible to get two of any building in one city? Also, having engineer specialist or Super specialists would increase the chance of an addition.
The above list would only be for non-wonder buildings. Wonders could be as follows: 5% chance for the following when a wonder is built, but each wonder could have more than one at once. Suggested wonder additions:
Scenic Overlook: +1 Great Artist point
Altar: +1 Great prophet
Etc. (Can't think of names for others at the moment.)
Negative surprises occuring would also add to suspense, but you need to not do these or be careful to avoid screwing up someone's valid strategy. (No one should see: "Your training yard was canceled!") Maybe a one turn delay, no more than once per building, 5% of the time. Maybe poor contstruction leading to unhappy or unhealth for 5 turns. If so, have sage specialists decrease the chance.