On lines 69/70, you will notice border-bottom/border-top. The color values associated with these are where you can change the color of the slant. (These are the same lines in the mirrored version).

Add the code, and click on the image. Add in the gallery widget with all your images and alt tags, using the thumbnail option. Ta-da! You have a cool thumbnail table gallery!

Add the code, and click on the image. Add in a form widget.

Add the code, and click on the image. Add in a form widget with two input fields. The widths do not matter, the only thing is that more than 2 input fields could cause complications going to mobile view.

For this block, there is instructions in the actual template related to using it.

To utilize this pattern, add a content block under a KV, CTA, etc. and paste in the copied code. The colors can be edited in the background-image property of the CSS.