Oysters at the Oyster Festival

Are there creative ways of using oyster shells other than building grotters, i am thinking how great it would be if visitors to Whitstable during the festival were to keep happening  across  creative constructions of oyster shells. Oyster as art as it were.  Any ideas? We don’t have much cash to spend
but we can look at paying expenses if anyone has a really brilliant idea they’d like to propose…. Just mail me on mair@mairstratton.com