Here are two LZX Castle patch examples, as described by mr. Phil Baljeu himself on the LZX Community Forum.

Patch 1:

At the end of this exercise you should be able to digitize a video source and create a posterize effect.
The first piece of gear I saw posterize on was on my first video mixer, the Panasonic MX-10,
it had a rotary switch that you could use to select how many ‘slices’ of Posterizing you would have.
You can do the same with this patch by removing any of the Data outputs from the DAC.
Tools needed for this exercise are: Castle ADC, Castle DAC, and a video source.

First take your luma video source, I’ve used a simple ramp shape from the Visual Cortex H+V output, but you can use any video source.
Take your video source and input it into the Castle ADC. Patch from ADC outputs D0-D2 to the DAC D0-D2 inputs,
and from the DAC output to your video output. The Gain control on the ADC goes from non-inverted on the left through
zero to inverted on the right. Set the gain to around 9 o’clock. Adjust the Bias control on the ADC until you can see 8 discrete levels including black.
This patch constitutes the basic input and output of the Castle system.


Patch 2:

At the end of this exercise you should be able to *pixelate a digitized video source.
This exercise expands upon the previous exercise; Castle Patching 001: Digitizing Luma Video Sources.
I call this a digital sample and hold because like an analog sample and hold this will hold the 3-bit binary value at the D0-D2 inputs at the rising edge
of an incoming clock signal until the next clock pulse comes in. The held value appears at the D0-D2 outputs.
Tools needed for this exercise are: Castle ADC, Castle DAC, Castle Clock VCO (or other VCO), Castle D Flip Flops, and a video source.

*I say pixelate, because the effect looks similar, but unlike pixels which are rectangular or square, this effect is on a per line basis.
It also isn’t constrained to a global pixel clock, you can vary the clock at video rates and get unusual pixel geometry.

Take the patch from exercise 001, and instead of going from the ADC to the DAC, go from ADC outputs D0-D2 and put them in to the D0-D2 inputs of the D Flip Flops.
Set the Castle Clock VCO to HI Range, and H sync. Set the frequency at its highest value to start. Take the output of the Clock VCO to the CLK input of the D Flip Flops.
Take the D Flip Flop outputs D0-D2 in to the DAC D0-D2 inputs. The DAC output will go to your video output.
Now have fun varying the Clock with CV inputs, or rearranging D0-D2 in any order. This completes the Castle Digital Sample and Hold patch.

This was probably the most exciting effect for me when I was first designing the Castle series.
The idea of varying the size and shape of a pixel seemed so interesting, it would open up a completely new look beyond video games.
Once I saw the effect come alive on screen I knew it would be something I would use time and again in my patches.