[image by Geekhouse Bikes via flickr]
Here is one from Geekhouse that I must say is spectacular. Personally, I consider this colour scheme "feminine", in the sense that the colours are traditionally seen on women's clothing and accessories. However, it is a diamond frame.
[image by sleepyneko via flickr]
On the other hand, here is a mixte by Velo Orange. The frame is typically viewed as a "women's frame" (at least in the US), yet the colour scheme is traditionally "masculine": a solid, conservative blue.
In a controlled study, I wonder which bicycle would be more appealing to women. (Research grant?)