Yes, it is overly luxurious to change shower products with the seasons. It really isn't too hard to make your own (even bath salts that usually cost $15 and up. . . you can make them yourself for less than $5 a pop. Great gifts, too!) If you're a bit lazy and have some extra cash to throw around, try these on for size:
Burt's Bees Citrus Spice Exfoliating Soap (smells like pumpkin pie, no joke) is natural and relatively local to me. . . which means you're not supporting a huge cosmetics giant.
The Thymes candles (top and bottom right) in chocolate ginger and chocolate mandarin, respectively. Maybe take a piece of chocolate in there with you to satiate the hunger pangs you'll get from such luscious scents.
Morton Brown's Gingerlily lotion: you will not find a lotion that dries smoother and silkier (at least I haven't), and you'll carry traces of the fragrance with you all day long, wondering what smells so yummy.