gardening project on the theme of pirates????

i've been given a project for a group with severe learning difficulties around gardening,
the problem is that they have NO outdoor space at all and they want the project to be on the theme of .........pirates!!!
i have absolutely no idea what to do with them, any thoughts?
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You could grow mustard and cress as hair in egg shells with a painted pirate face.
Sorry can't think of anything else though
I take it a plank to walk is out of the question?
Appropriate plant names is certainly a good place to start. The pond /island in a container is a great idea. I'd use a plastic one though - wood could be a major issue indoors when it dries out.
Definitely sensory items - the coconut shells is a good example. Plants that like 'desert/tropical ' conditions, so the palms again, and maybe a few of those sundews and flycatchers which children love, depending on the ages and stages. Grasses - as long as it's not the ones that cut your hands open when you run your hand alsong the edges.
A container of sand for the actual buried treasure B'cupdays mentioned. They could just be acorns, shells [?] and pine cones and other little similar bits and pieces which will stand up to lots of handling, with perhaps a proper little gold item of some kind.
Oh - and you have to wear an eye patch and a parrot on your shoulder when you're doing it. That's the law
Can't you get them to change their minds, feel for you figuring this one out. Good Luck.
I'd like to think whatever you do will be well received. Keep it simple, and good luck