Over the years each time, I encountered a beautiful hand-drawn sketch, have tried to mimic it in Sketchup and here you will find some of them for free:
https://community.sketchucation.com/topic/164079/new-styles-by-majid
A sneak peek:

!

سلام به همگی
طی این سالهاییکه با اسکچاپ کار میکردم هرموقع یه اسکیس دستی دیدم سعی کردم استایل اسکچاپیش رو درست کنم و به این ترتیب تعدادی استایل شخصی جمع شد.
سه تاش رو بصورت رایگان در این پست قرار دادم که امیدوارم خوشتون بیاد
معمولا به
Monochrome, Hidden line
و درحالیکه سایه روشنه بهترین جواب رو میگیرید.
همیشه هدف ارائه نهایی نبوده و خیلی وقتا اصلا ارائه دانشجویی یا هنری مد نظرم بوده...
لطفا سری بزنید به این پست
https://community.sketchucation.com/topic/164079/new-styles-by-majid/3

This set tends to hand-drawn sketching mood. More than 20 styles I have developed over years. Some precise and some very loose.
I hope you like them. I will share them all on the Shop.

16 Stright pen _ Sketchy blue background.zip

Here is another set, designed for conceptual presentation to ignite discussion or heavily artistic expression. Hereby I attach one and will share the set on the Shop.

Brown pen Stright lines and black charcoal Sky.zip

Over time I have developed and built up a set of styles for different presentation purposes.
While in the initial phases of design, we usually do not care about details or materials or we are in a hurry to rapidly prepare a decent presentation. I have developed a handful of sketchy styles based on a selection of the best sketches I have ever seen.

Here you will find one of them zipped and I will share more on the Shop section.
I hope you find them handy as well.

Construction Documentation Style on paper.zip

@SilentFart

But you haven't mentioned the next step where I gave you the exact menu-path to it...
Tools > Fredo6 Collection submenu, as 'ThruPaint'....

What are you looking for in the Tools menu? Note what it says in Usage.

@SilentFart

You need to restart SketchUp after it's installed to sync everything.
After that it's listed under the menu 'Tool's > 'Fredo6 Collection' submenu, as 'ThruPaint'....

@sievthong did you look under the Tools menu where it says it is?