Today, Rusty informed me that if I took some Marmite and hit it for a while, it would change colour, going from dark brown all the way through to white. My attention span isn't *quite* what it could be, so I haven't got as far as white, but I did get to a very pale yellowy brown before getting bored. Then I added a dollop of fresh Marmite for colour comparison purposes. Photoshop has not been used; Marmite really *does* go that pale when whacked with a spoon for half an hour! (You can see some of the intermediate shades of brown around the edges as well. ^_^)
I'm thinking about spraying on a fixative and submitting this piece to the Tate Modern with the title 'Colossal Waste Of Time'. People will either love it or hate it (o ho ho ho).