User Problem

In the Timeline view of a board would be nice to have a way to add colors to cards. 
With the colored cards, it would be possible to use more filters, such as member and label (being the color on the card) at the same time. 

Suggested Solutions

Add colors to cards specifically for timeline view. 

Current Workarounds

A possible workaround would be to apply labels to cards and change the layout in the Timeline view to label.