I need to generate periodic (daily, monthly) web analytics dashboard reports. They will be static and don't require interaction, so imagine a PDF file as the target output. The reports will mix tables and charts (mainly sparkline and bullet graphs created with ggplot2). Think Stephen Few/Perceptual Edge style dashboards, such as: 
but applied to web analytics.
Any suggestions on what packages to use creating these dashboard reports?
My first intuition is to use R markdown and knitr, but perhaps you've found a better solution. I can't seem to find rich examples of dashboards generated from R.
Shiny is a framework for generating HTML-based apps that execute R code dynamically. Shiny apps can stand alone or be built into Markdown documents with knitr, and Shiny development is fully integrated into RStudio. There's even a free service called shinyapps.io for hosting Shiny apps, the shiny package has functions for deploying Shiny apps directly from R, and RStudio has a GUI interface for calling those functions. There's plenty more info in the Tutorial section of the site.
Since it essentially "compiles" the whole thing to JavaScript and HTML, you can use CSS to freely change the formatting and layout, although Shiny has decent wrapper functionality for this. But it just so happens that their default color scheme is similar to the one in the screenshot you posted.
edit: I just realized you don't need them to be dynamic. Shiny still makes very nice-looking webpages out of the box, with lots of options for rearranging elements. There's also functionality for downloading plots, so you can generate your dashboard every month by just updating your data files in the app, and then saving the resulting image to PDF.
