Ok so in the end I came up with a bunch of stuff!
I put a black bin liner over a cardboard box and made a white lid with card and paper. In the box I put:

A pop art painting of the characters
Some Dharma beer and food cases- these are the easiest things to transform into Lost themed food, you can search 'dharma food labels' in google and download some then print.
Character quiz cards- I printed a picture of each character (I chose 3 in total) and backed them onto white paper, then wrote on the back some questions about the character.
A paper plane- I made an ordinary paper aeroplane and coloured, painted, burned the paper and wrote random show quotes inside.
A fridge magnet- I altered a fridge magnet with card, some pretty paper, ribbon and paint and put on it a quote from Sawyer.

