I got a bit worried myself and set about making examples for the pupils to see. As the COBET children speak Swahili and have very little English, I wouldn't be able to explain very well what they could make with the LEGO.
I showed them the samples I had made and then showed them the LEGO pieces. Through their teacher translating into Swahili I asked them to make a vehicle and off they went to work.
These kids were intent on making their vehicles and trying every tiny piece of LEGO. It was amazing to see what they came up with.
Finally I had to choose the best vehicle and pictured below is the winner with her prize of the Sinking Ship board game.