Before we come up with some cool slogans, let's first take a look at the history of Mohenjo Daro.
Mohenjo Daro was a city in what historians refer to as the Indus River Valley, one of the oldest agricultural settlements (along with Shang China, Egypt, and Mesopotamiaa). Mohenjo Daro was located on the Indus River and was one of two large cities there; another famous one was Harappa.
Unfortunately, we cannot translate Mohenjo Daro's pictographic alphabet. We have evidence that its people kept records, and we have even found evidence that they traded with their Western neighbors, Mesopotamia, because stone tablets with Indus script have been found in Mesopotamia. But, unlike with Mesopotamia and Egypt, we never uncovered a "Rosetta stone" for the Indus peoples. It also doesn't help that when the Aryans from the north invaded and settled what we would now recognize as India, they removed many traces of Mohenjo Daro's culture.
From archaeological evidence and comparative analysis with other contemporary cultures, we do know some things about Mohenjo Daro. I'll try to keep it relevant to the list you mentioned in your question. Mohenjo Daro had a single ruler, and its social structure would have mirrored the usual—leader on top, then nobility, then merchants and artisans, and peasants on the bottom. It was polytheistic, as many early civilizations were. What was unique about Mohenjo Daro was its advanced sewage system and its grid-like street patterns; clearly, a lot of thought was put into urban planning. There were citadels at the top of the city, where their high position could be used to signal invading groups or offer religious services. Trenches dug from the citadel and down out of the city carried water and waste, keeping the city clean and organized.
If you were to come up with slogans for Mohenjo Daro, I would consider pushing this last aspect. It was what made Mohenjo Daro unique compared to contemporary river valley civilizations. Perhaps something like "Mohenjo Daro: the cleanest city this side of the Ganges!" or "Come for the spice, stay for life!" or "Mohenjo Daro: let our citadel keep you safe!" would work well.