Some photographers prefer using ordinary bags with padded inserts to carry their camera gear, both for aesthetic reason and to prevent theft. Instead of buying an insert, you can also make a custom one with some foam, fabric, and velcro. Abi over at vanilla & lace made one to turn her purse into a camera bag after finding that purse-style camera bags can cost up to $300. She also wrote up a helpful tutorial on how you can do the same.
DIY camera purse/bag [vanilla & lace]