Place a cylindrical aquarium in the center of the spiral stairway, so that you can enjoy the aquarium while you are walking the stairway.
Oblige aviation companies to give compensation in Miles to its passengers with delayed flights. Maybe 1.000 miles per hour lost.
The Idea is to raise a fund (Charity Hedge) that will spend the return on charity each month. Anybody can submit and vote for causes.
Banks should provide a secret RSS channel that shows the last transactions and total balance of our bank account.
People would walk more than they drive if there were moving walkways above the streets, all along its whole path. #rollingstreets
Too many people get wet because of unexpected storms. Public umbrellas would solve that problem.
Create a movement in Belo Horizonte, just like Guerrilla Gardening, to incentivate people to take care of gardens around the city.