Hello, Gerber,
From the private thread that we have discussed the same approach, I understand that you have already found the solution you were looking for. However, I will post my reply here for any future visits to the same topic.
This functionality is not a built-in property of the marker but it is easily achievable by adding an event handler to the markerActivate event.
At this point, I suggest either adding a class to the marker element and then targeting the colour with CSS rules:
http://dojo.telerik.com/@bubblemaster/EXIxEmUS
You may submit an official Feature request if such functionality is important to you. I had a look through the ones that we have for DataViz and Map but there wasn't one for a colour field of the marker data.
http://kendoui-feedback.telerik.com/forums/127393-kendo-ui-feedback?category_id=46450&query=map
The most popular requests get looked at by the Product Manager and pushed forward to the roadmap.
Let me know if I may assist you further.
Kind Regards,
Alex Hajigeorgieva
Progress Telerik