I did notice them (on github).
Thank you for adding to and improving on an already great tool.
For my taste the icons, on an older iPhone 4, were a bit large. I have to try on another iDevice (iPhone/iPad) to see if this initial conclusion holds up.
Regrettably my OPDS reader of choice, Marvin for iOS, does not seem to support icons in the OPDS feed (not that i missed this feature until now

).
I, personally, am not in favour of a colored web template for COPS. The interface should not distract from the content, and for me to much colour does. But YMMV.
Keep up the good work!