PC Nigel Bird, who led the Trehafod BMX bike track initiative, said it had brought "a massive improvement to the area", with a 70 percent cut in anti-social behaviour locally.
More top news
Laura Evison posts photos of the flowers to Facebook for people to find in order to 'spread some happiness.'
The Cardiff Model has also been adopted around the world, in countries such as Netherlands, United States, Australia and South Africa.
The charity says its counselling service Childline has seen a spike in sessions about race and faith-based bullying in recent months.