"I think this is a brilliant idea and all for a good cause" says Beatrice, 10, from London. "It's a fun day for us but it's not fun for the children we have been learning about," says 10-year-old Jay.
At a school in Scotland they decided to do a coin mile as well as non-uniform day. Pupils collect spare change, bring it to school and stick them down on the coin mile.
"We want to raise more money for Unicef this year than we did last year," say Ashleigh and Sarah, both aged 11.