That bell is adorable.

How different we all are! I would love a red-black-white bike, since red is my favorite color. Alas, they don't exist in entry-to-mid-level WSD frames most of the time.

Accessorizing your bike in coordinating colors, as others have said, is probably the best way to "girlify" your bike--most guys would probably just go for black everything. Personally, I'd go with red and white, unless you hate red--those are easy colors to match and lots of things exist in those colors. A red saddle bag (the one Muirenn linked to looks fun!), perhaps, and those heart cog reflective stickers are cute. White or red bottle cages?

Remember, red ones go faster!