School project - small white outdoor wall tiles

[JobMatch3000]

I have an idea for a school fundraiser and I'm wondering if it might have traction or if it's doomed to failure:
I'd like to give each pupil the opportunity to paint a small (10cm x 10cm) wall tile, which would then be used to create a random mosaic on one or more of the external walls of the building for "prosperity" / celebrate the year 2025.
Kids would be invited to buy a tile and instead of the usual hour spent attending the annual fundraising"afternoon fête" (where kids spend money on disposable plastic toys or sweets, having glitter tattoos or playing "beat the goalie" etc) this time could instead be used for their art.
I'm thinking the Council's Facilities team could install the mosaic for us - if a parent plasterer/tiler volunteer is not forthcoming.
Do you think this is a good idea or do we just stick with the usual fête?
We are a low income area. How much would you pay for a tile?
(No calcs yet done on upfront tile costs, waterproof tile paint or adhesive/grout etc).
How could we include children who can't afford to pay anything?
What else might we need to consider (permission from the Council, risk assessment etc).
I don't yet want to share my idea with the school yet so I'm undertaking some MN research/market testing first for a sense check!

How much would the tiles be? They will be pennies each for basic squares.

I have a title my DD painted. It cost the parents nothing. I think you couldn’t ask for more than a couple of pound and should use any school funds to cover it.

i think the fete would still be needed as it’ll probably raise more

I don't know, maybe £3 per tile?

You'd have to supply the paint though because certain paints would be unsuitable for example if you want to use an outside wall.

There is no way on God's earth the council will send anyone to erect it for free though I'm afraid.

And then you also have to remember there will be many disappointed children, who really enjoy the annual fundraising afternoon fête and all it involves.

It's a terrible idea for many reasons, not least:
You could only ever do this once so how will you top it for future year groups?
Cleaning, maintenance and safety - tiles chip and crack easily and a shard could really hurt a kid.
The Council are far too busy to be installing huge mosaics.
Does the school even want a big mosaic on one of their walls? I think once they get wind of this they'll tell you nope pretty quickly.