Over years, I have built up my personalized styles. Each time scanned proper lines, and wrapped them up as a style file and recently published them all.
Here are free samples to grab:
16-stright-pen-_-sketchy-blue-background.zip (1.7 MB)
brown-pen-stright-lines-and-black-charcoal-sky.zip (1.6 MB)
construction-documentation-style-on-paper.zip (278.5 KB)
Great work and very generous of you to share. 
I revised some of my personal styles and am going to publish them as well, and here is a glimpse of some of them.
To have different line colors, I have adjusted the color for the “selected objects” as well.
Plz have a look:
To have different line colors I adjusted the color of “selected objects” as well. This way, without assigning any material to objects and using “backface” color in Monochrome mode you will reach a decent, beautiful presentation in no time and with less effort.
If interested grab these recent ones from here.
Agree, thank you.. rekindles my interest in artistic styles
You know, I belong to a generation of architects who witnessed drastic changes in tools. When I started my university it was all hand drawings, while I left university,y while was good at 3D Modeling using 3Ds Max (V. 3x) and drawing using Autocad, and nowadays I benefit AI. By the way, I always use all my skills from sketching to digital tools.
I love Sketchup because of its intuitiveness and style of presentations, which keeps discussion and communication open.
A few more examples applied to a model with more lines. Each style is carefully adjusted to get rid of Sketchup’s default gray shadows. No need to apply materials, they work best in Monochrome mode for the fastest possible result
they are beautiful, thanks for sharing!
Good stuff, thanks for sharing!
I appreciate it.
I will share more of my stuff soon.
