An insulated travel mug is a nice gift. Does the car have a cassette or CD player? Something in which to hold and store cassettes or CDs to keep them from falling all over the place is nice. I've asked for a visor sleeve that holds CDs. There's another idea; a visor organizer to hold pens, memo pad, whatever.
Yeah, great idea! Then I can write as I drive... no? That's not it?
I have a cd holder thing. It seems to smudge my cds sometimes, though, and I don't know why.
That little car has soooo many places to store things already that it boggles the mind! But I liked Hair's idea of books on CD.