Everybody's participation
PLEASE READ THE CONCEPT NEXT LINE:

Solution

Concept: Persons getting together to achieve a general shape, just as UNICEF brings people together to reach a common goal: help children. 
People: refering to donors and persons behind UNICEF project

Celebration: resembling the holidays
Christmas tree as a holiday key graphic
Different color options, and also, maybe other shapes (xmas tree, snowman, etc)

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