Hi and welcome from chilly Australia. I used to visit Brighton years ago and have many fond memories.
If you are looking for a way to re-use materials to make a quilt of your top, you could just use an old blanket as batting and an old sheet for the back?
As for how to finish off the blocks, I prefer to impose a little bit of structure on craziness and square them off with a little border, but that it not to everyone's taste!
Don't forget to post photos- we all love to see each other's work.