Resurrecting this thread with a couple of ideas, both from Russell Norman's Polpo. The Cichèti chapter in the book has a lot of ideas for "stuff on toast".
Goat's cheese, Roasted Grape and Walnut Bruschette, recipe available online here (that link takes you to a multi-page excerpt from Polpo with several recipes. This recipe appears on pages 16-17 of that excerpt so you need to click the right arrow 8 times to get to it)
Broad Bean, Mint and Ricotta Bruschetta, recipe available online here.
