A recent visit to the Pittsburgh Center for Creative Reuse (https://pccr.org/) turned up a wonderful selection of used stencils for 25 cents each. I decided to test some out in my weekly planner. Because I wanted to be able to write with a ballpoint pen on the page, I used watercolors. I dabbed on the paint first with a brush, but found that it spread too much, so I tried a makeup sponge.
After the paint dried, I added in some definition and design with a few Posca paint markers.
When I looked at the finished results, I liked the design, but realized that the paint was too dark for the details of the week to be legible.
I turned the page & started fresh with the Posca markers.
Adding a few feathers in lighter colors with Posca pens worked out well, decorating the page but not being so dark or detailed that I couldn't see what I wrote on each date.
If you create something that doesn't turn out as you like, turn the page and start fresh! You now have valuable information about what doesn't work, and probably have lots of ideas on how you could do it better.