I'm not sure if the Maharal says this per se but I heard a beautiful mashal on the woman: when this object or matter changes shape the outer object or matter changes to that shape and so on. The inner object represents the woman and the outer shape represents the man. I was wondering where it's from and if it is from the Maharal, where does he say it?
The idea that you are referring to is called "Chomer" and "Tzurah" and is a recurring theme in the philosophy of the Maharal that extends beyond the mashal of man/woman.
The Maharal (Gur Aryeh, Devarim: 25:18) relates that all of creation is built in two complementary systems - Tzurah and Chomer. Tzurah is the influential force, providing a general direction and a general outline, or form. Chomer is the force that takes this influence and uses it to give form to matter, to put things in the proper place and composition.
For instance, Bereishit Bara Elokim Et Hashamayim Ve'et Ha'aretz. This is the first pair of complementary forces. Shamayim is the influential - the Tzurah. It provides a general form and direction. It provides the rain, and it envelopes all of creation. Aretz is the receiver of the influence. It receives the rain and uses it to bring forth vegetation, crops and minerals - the Chomer of the world.
In the same way, Zachar and Nekevah are complementary forces. The Zachar, the male, represents the "Tzurah" - the influential force that provides a general form and direction, while the Nekevah, the female, receives that influence and uses it to provide substance through birth, raising children, and providing the family with its needs. The woman takes the influence of the man and brings it into practice and fruition.
(English explanation courtesy of Ramat Shilo)