I saw a sketchbook online called, "The Tomato Diaries." An artist traveled Europe with a tomato for a couple of months and documented the tomato everyday by drawing or painting it (ooh, there's that doing something everyday again theme) - the lush tomato definitely, er, um, evolved over time - I don't think I'll be doing that, but it's a good idea.
p.s. this is yesterday's painting, I did it at night, not my preference, because I went to bed before the paint dried and couldn't scan it in.