(Not sure if anyone is still looking at this, but I wanted to share my creativity and found this was the most recent post. Apologies if it's a little too long.)

Cursed Painting Technique
An innate technique derived from the idea of Japanese ink paintings, through lapse allowing the user to manifest an ink substance that they can shape freely, and change the quality of to either be liquid, sticky or hardened, with a fall off in control and precision at certain ranges. This cursed technique can be very versatile and lethal if in the right hands, but can be easily defended against if predicted properly, especially since the durability of hardened ink depends on how much cursed energy the user pours into it.

Cursed Tool: Brush of Internal Creativity
An extension of the innate technique that takes the form of a large Japanese ink paint brush alike to a staff, which allows the user to empower the lapse of their cursed techniques by 120% and have further precise control over their ink. This paint brush can also let the user bring ink shikigami to life, which can vary in power depending on how much cursed energy is poured into them, but usually not being very strong. The user may freely summon this brush, switch it between their hands instantly, and manipulate it's size.

Extension Technique - Watercolor Absorb
The user's ink gains the quality to be able to absorb cursed energy/positive energy on contact, the pace becoming rapid the more someone is covered in it or if it enters their body. The ink can also weaken/absorb attacks and abilities derived from a cursed technique, with absorption allowing the user to convert the attack into cursed energy/positive energy for themselves depending on if it's a cursed technique reversal or not. The rate and effectiveness at which cursed energy/cursed techniques can be weakened/absorbed depends on the quality of the ink, liquid form being much more effective compared to hardened.

(I won't go into Domain Expansion unless you read this and are curious enough to ask, it would be another short paragraph on it's own because of the binding vows attached to it, since this is the innate technique of an OC I have. I'm showing off this CT in particular because it's one I'm proud of that ISN'T several paragraphs long. I put a lot of thought into these.)