I'm nearly positive this is the 10,000th time you've gotten this request, But these plugins are very beneficial.
Name: goPaint, goBrush
Links:
goBrush: https://www.spigotmc.org/resources/gobrush.23118/
goPaint: https://www.spigotmc.org/resources/gopaint.27717/
Desc: These plugins are insanely useful for builders. They allow instant terraforming, coloring, and detailing of terrain with a wide array of brushes. Paired with world edit and voxelsniper, they can be used to create beautiful scenery or themed spaces for building.
Thank you very much.