I love crostini, but I'm not personally a big fan of tapenade. An alternative might be pesto topped with diced tomatoes, or goat cheese topped with marinated roasted red peppers. Or you could offer a variety. Another option would be an antipasto platter with Italian cured meats, cheeses, olives, fruit, etc.
The trouble with eating Italian food is that five or six days later you're hungry again. ~ George Miller