The east London hospice has teamed up with local estate agent Morgan Randall for the appeal, in which supporters will pay a minimum of £10 each to have their pictures on a car. That car will tour the capital's shopping centres until September to recruit donors. Once it has secured enough supporters, their faces will be put on the estate agent's entire fleet of 20 cars.
The charity hopes to raise £150,000 towards the £1.8m a year it spends on supporting children in London with life-threatening illnesses.
"This is a campaign with a personal touch," said Viv Talbot, community fundraising manager for the hospice. "It's a unique opportunity for us to raise a lot of money at the same time as raising awareness of our work through the visibility of the cars in the city."