He have to remove this task, the module bar is outside our scope and will be handle by the UX Initiative team.
According to the mockup the module icons in the module bar should be mono-chome (black-and-white). The icons are fetched from the TYPO3 icons repository which makes it difficult to apply changes without them either being overridden or creating a new version in the icons repository.
Dealing with the icons we also discovered, that they need to be refactored more detailed than just changing the colors. Some icons are used for more purposes than just the module bar (e.g. dashboard,redirects, reports), other icons need to be simplified in the drawing instructions. Currently these are not consistent: outline and blank space vs. stacked shapes and fills.
For proof of concept a hotfix in the Gruntfile.js was implemented, which of course needs to be removed when creating a PR, so that the icons could be changed directly in the Resources/Public/Icons directory of the corresponding extensions.
TODO:
Mockup:
Rachel > finally we handled thing with CSS we don't need anymore to change the icons