Styling and widget guidelines

[daffl]

I saw that an old version of the jQuery UI CSS styles had been added but it is not being used everywhere. For the public release it would be neat to have widgets support the CSS framework as many people are familiar with the jQuery UI looks and theming (and it looks decent without having to spent time on design ;). I created a JavaScriptMVC looking theme a while ago, maybe that could be used for the demos?
And maybe it makes sense to standardize how UI widgets (like the Grid, Accordion, Combobox or Tabs) are generating their markup (class names as optionss?), reference views via options etc.
Any thoughts?