Gift ideas for my mum

My mum is one of those people who "have everything." In other words, the hardest kind to get gift ideas for. Because you want to buy them something they will actually use, which if they have "everything" then it is hard to find any void in their life, no matter how small.

So what I am currently considering is: a can crusher, a "Come In/Go Away" door mat, and a home pizza maker oven. I like the little USB plasma ball, but doubt she would not be as interested in it, nor would she want to have it draining power off her iBook!