Now that functionally thing are looking more stable with the extensions, I took some time to improve the visuals based on feedback by the one and only Hylke Bons...
This iteration was about making the extensions look like the rest of GNOME Shell... The guideline here was the "search view", which reduces clutter. Also the "Today" section is expanded by default
Here is a brief comparison
The code is up on github if you want to play with it https://github.com/seiflotfy/gnome-shell-zeitgeist-extension