The kanban supports two color modes accessed via the Color dropdown above the board.

By value

Cards are tinted by deal value across 5 tiers:

Use this to scan for whales without sorting or filtering.

By age

Cards are tinted by days-in-current-stage across 4 tiers:

Use this to find deals that are slipping through the cracks. A deal sitting in Negotiation for 90 days is usually a problem.

None

Turns coloring off and gives you a clean white board. Some teams prefer this for screenshot-friendly stand-ups.