Thanks for your wonderful comments. I truly hope you enjoy many days of doogiePIM.
I purposely designed the User Interface to give it a less distracting look. The work and focus is on the document you're writing. Therefore, having colourful icons around the screen distracts from the focus. This is my opinion, of course. I can understand some like colours, hence the ability to change the icon colour and the theme colour. You can probably tell from my photo, I'm a grey kind of guy :).
How to change the User Interface colour
1. In the [Tools] / [Settings & Preferences] choose [Color and UI behaviour] and change the two colours to your content.
In the future, I'll add more variety of options to change more of the user interface.
Many thanks for the suggestion. Please keep the ideas and suggestions coming :)