A seamless tile of a stylized animal print. It is based on Cheetah/Leopard fur but stylized to be shaped like hearts instead of natural spots.
It's my very first seamless tile like this, so I'm sorry if it's not very good.

The best settings for grayscale and manga (in my opinion) are to apply the tile as you like, edit both the brightness and contrast to +15 and then turn it into a tone or grayscale layer to optimize the detail.
The settings for this particular sample are the original color tile, increased brightness and contrast by +15 and made as a tone layer. The tone layer is 80 number-of-lines with the dots at 40 degrees to prevent a moire effect.