pastiche A literary, artistic, musical, or architectural work that imitates the style of previous work.―Merriam-Webster dictionary
I recently implemented pastiche, a PyTorch-based Python program for applying neural style transfer . Given a content image C and a style image S, neural style transfer (NST) synthesizes a new image I that retains the content from C and style from S. This is achieved by iteratively updating I so that relevant properties of its representation within the VGG neural network  approach the corresponding properties for C and S.
The library is available on PyPI and can be installed with pip.
$ pip3 install pastiche
The command line usage is shown below. Use
--help to access documentation for the additional options (e.g.,
--device for controlling whether to use a CPU or GPU).
$ pastiche CONTENT STYLE OUTPUT
CONTENT is the path to the content image,
STYLE is the path to the style image, and
OUTPUT is the path to save the synthesized pastiche PNG file.
If the launcher script was not installed within a directory on your
PATH, pastiche can be launched by passing its module name to Python.
$ python3 -m pastiche CONTENT STYLE OUTPUT
The source code is available on GitHub:
--preserve-color option can be used to retain colors from the content image.
 Gatys, Leon A., Alexander S. Ecker, and Matthias Bethge. “A Neural Algorithm of Artistic Style.” ArXiv:1508.06576 [Cs, q-Bio], August 26, 2015. http://arxiv.org/abs/1508.06576.
 Gatys, Leon A., Alexander S. Ecker, Matthias Bethge, Aaron Hertzmann, and Eli Shechtman. “Controlling Perceptual Factors in Neural Style Transfer.” ArXiv:1611.07865 [Cs], November 23, 2016. http://arxiv.org/abs/1611.07865.
 Simonyan, Karen, and Andrew Zisserman. “Very Deep Convolutional Networks for Large-Scale Image Recognition.” ArXiv:1409.1556 [Cs], September 4, 2014. http://arxiv.org/abs/1409.1556.