If you want to achieve something like this (just a quick example) →
Then you can try it with my improved version of @Pesi’s “Watercolor Page”, which you’ll find and can download from here →
But you have to use different patterns. I took them from the archive linked below, in the example above you see the pattern “Michelist - Canvas Cotton Linen - seamless.jpg”, but some of the “xara24 (Webdesigner Lab) - Fabric Seamless Patterns Vol. 3” and the “xara24 (Webdesigner Lab) - Free Denim Patterns” may be interesting objects too, for convenience and in order to use them I converted them to the GIMP-PAT Format that Krita can handle (the original website seems to no longer exist, but you can find it in the internet-archive → “https://web.archive.org/web/20200703175810/https://webdesignerlab.com/”, the 2 “Michelist”-Patterns are my own property, you can use them freely under Creative Commons (CC 0)). →
To use these patterns, you can make a copy of the “Grain”-Layer below the “Sepia”-Layer (or you use the Grain-Layer, if you are too lazy) and then go in this layer’s properties to assign a different pattern to it. Try to find a pattern you like, you can also use own patterns for this if you got such.
Since Xara Webdesignerlab’s rules require me to post the links to their resources, I hereby do so. Since their resources are now accessible via Archive.org, and the site itself is down, I should have fulfilled all requirements. Here are the links of the patterns in my archive:
https://web.archive.org/web/20190501205826/http://webdesignerlab.com/resources/free-denim-patterns
Michelist