For as long as many residents of Nairobi can remember, the Kenyan capital has been awash with red every 14 February.
On Valentine's Day, people are dressed in red, the colour of love and romance, or are carrying red roses.
Traders are quick to cash in, selling fresh blooms from local farms, as Kenya is one of the world's top producers of cut flowers.
Recently though, instead of the soft red petals, some people have been opting for the brown, blue or purple of crisp banknotes, folded, rolled or fastened together into floral-like bouquets.
The trend has spread to other African countries and has become so pervasive that it has drawn the concern of central banks in Kenya, Uganda, Rwanda, Botswana and Namibia.
