The postcard-sized works, completed by enthusiasts from 22 schools of the city, are already on display at the Aspinwall House in Fort Kochi.
Bijibal, who made his debut in film music direction with the 2007 Malayalam movie 'Arabikkatha', will inaugurate the gallery at a corridor of the sea-facing heritage building tomorrow.
Some children's paintings are with BBC, which is currently making a documentary on India's first biennale, according to the Kochi Biennale Foundation.
The exhibition, which comes as an output of a students' outreach programme being organised under the ongoing fest, has much of its contribution from schools in West Kochi.
The Children's Gallery has a large display of postcards relating to scenic spots, popular cartoon characters on television, flowers and foliage.
