One ceremony was held in Vukovar on Tuesday morning and the other in Osijek on Tuesday afternoon.
Some 900 children from 30 elementary schools entered their art and literary works in the "Children Together" contest, which was aimed at promoting friendship and coexistence in the Danube region, the Mission of the Organisation for Security and Cooperation in Europe (OSCE) said on its website.
Speaking at the award ceremony, the Head of the OSCE Mission, Ambassador Jorge Fuentes, said he hoped that this project would contribute to the growing atmosphere of trust and friendship developing among children of this formerly troubled region.
Fuentes said that the OSCE Mission had participated in the implementation of over 500 projects in Croatia for ten years.