Not wishing to  rain on the parad....err, egos of the youth art cadre, but, following a theme is the very essence of Prior Restraint. Google the First Amendment. Prior Restraint is the polar opposite of free art making without being restrained by a theme. This is not the best use of your talents and energies. You are being used by whoever it is that prescribes a theme to restrain you to serving as zombies in pursuit of whatever their agenda is. You are not advertising agency designers or illustrators, making a campaign for the product being sold. Wake up - you are being used.