Graphite has been sent for review on the Ubuntu Software Centre.
Graphite Drawing now has a colour switcher button in the toolbar
Graphite drawing now supports saving, automatically of course, and opening saved files by tapping their icons in the All Sketches view.
Sketches drawn with Graphite now look more natural (despite my terrible drawing skills) because of an improved pencil tool.
In other news, the eraser tool has also been added allowing precise removal of unwanted pencil strokes.