@Blue_Monkey: Hopefully, you'll be able to throw in a few bits for the Harappans and Kushan?
I'll try not to boringly repeat the suggestions I've previously made in the AD threads, but there has to be a little overlap.
Harappans:
A site I really like on the Indus civ. Lots of images.
They used several agricultural techniques advanced for the ancient era. Obviously use the Harappan worker (could it serve as a UU? faster, with engineer skills?). Maybe free (of cost per turn) granaries (that also add +1 culture?) or early access to irrigation away from water access.
Their cities include the first urban sanitation system (sewer) in the world.
Tanks (public or ritual baths) as a unique building would be good also (+ to culture/happiness).
The Great Bath at Mohenjo-Daro (several pages of annotated slides) would be my choice for a Wonder. Here's a thumbnail gallery:
Another feature of the cities was their egalitarian structure. For example, there are no identifiable palace complexes, while there are public granaries, baths, assembly halls, master planning of roads and city layouts, etc., so early access to some democratic, republican, or at least oligarchic form of government would be appropriate.
One of the more famous artifacts of the Harappans. His headdress includes an ornament similar to several pieces known as eye-beads, which are gold with a steatite inlay. The identification of this figure, commonly called
the priest-king, is in fact not known. However, it would be an excellent inspiration for a LH (maybe call him "First Citizen"), or advisor. There is very minimal evidence of weaponry; they were probably a quite peaceful, friendly culture.
Archaeological evidence confirms widespread trade by the Harappans. One tech was extremely accurate weights and measures. Another possibility for a Wonder is
the Harbor at Lothal, featuring one of the first known tidal locks.
Kushans:
Right then, now that the Coritani are out of the game, who should get their archer advantage - this includes an archery range instead of a barracks in era one - free of maintenance fees, but requires wood in the city limits to be built - all archery units have +1 HP.
Since the
Kushan Empire is sort of standing in for the aggressive side of the Indian cultures, and archery is to the kshatryas what the sword is to the samurai, maybe this would be a good match for them. Kushans were also well known for their cavalry.
Suggestions for UUs: ...Kushan Empire (Ashvaka/Spearman) = Ashvaka Lancer is a horse unit.
Kushan units - a statue of Kanishka (note the stirrup like straps on the boots; maybe a model for the lancer unit?), drawings from bas-reliefs of two soldiers and a female guard:
I've recommended in several locations that, based on the Kushans' control of a major section of the Silk Road, the
Giant Buddhas of Bamiyan (the World Heritage site destroyed by the Taliban) would be an appropriate Wonder for them. Bamiyan was a major resting point on the Silk Road journey, with caravanserais and camping sites near the Buddhas. Around the statues the cliff face features many caves and hand-cut dwellings for monks. These were occupied by locals, who claimed descent from the monks, until they were driven out by the Taliban.
In their prime the larger of the two standing statues had a face of gold over a wooden frame. The head was hollow and worked as a giant megaphone through which monks would declaim the sayings of Buddha. At night the eyes, described as giant rubies, were back-lit by flames, creating the impression that Buddha's flickering glance was sweeping the valley. An even larger reclining Buddha was nearby, but is now lost (perhaps buried, but unlocated). If travellers' accounts are accurate it would have been the largest in the world. Records indicate that many travelers took a detour, or even made a special trip, just to enjoy the spectacle.
I'm going to incorporate the substance of this post into entries in my Bazaar thread.
The Goths are back! Glory to Gaut!
Who's that woman?
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I'm so happy with this!!! 
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