Our graphic designers have come up with a really rather beautiful theme for the quiz. I just wanted to share it with you. This is from our test server, part way through an attempt at an interactive quiz, and showing one of our drag-and-drop questions.
I am tempted to add that way of showing correct / partially correct / incorrent into standard Moodle for version 2.2. I think it is better than what we have at the moment in the standard themes.