Thanks.

How we made something like that:
Step 1: Open MSPaint.
Step 2: Use the Line Tool and the Curve Tool to make random, crossed lines.
Step 3: Make lines, both curved and straight from the lines you made to the sides.
Step 4: Fill it in with varied colors.
Step 5: Color the lines the same color as one of your sections.
Step 6: Make the image twice as wide.
Step 7: Copy and paste what you've made, flip it horizontally, and fill in the space with it.
Step 8: Copy the whole and and double the height.
Step 9: Paste and flip vertically.
Step 10: Place in the space.

"We"? You made that with someone else?

Btw, thanks for the guide! I'm trying it!

@Mero-kun - Nah, I just like talking like a symbiote (collection of beings that share one mind) sometimes.

@Yuffie - Danke. I personally think that sort of color scheme is best for my fancy line-portraits.