The palette
The pattern itself is the subject here: large blocks held by wide streets. Choose a street ink that sets the main streets clearly apart from the narrower ones threaded through the blocks, or the great squares will dissolve into an even weave. Green comes in a few strong places, Liberty Park, the foothills along the top, the banks of the river; a mid-toned green keeps them present without crowding the grid. Water is thin, a river and a few ponds, and needs an ink deep enough for a narrow line.