The painted stuff is there because people do not want to wait for the color. It can take a long time, or go pretty fast. It all depends on your chemistry and lights. Get the right chemistry and lights, and seed the tank properly, and it will move out.
Plenty of posts on the chemistry and seeding, and lights.
Find a nice rock from the LFS loaded with natural color. Periodically scrap off some coraline into a strong flow, it will come pretty quick.