Microsoft Dynamics CRM 2013 Update Rollup 1 introduced a new brighter blue color for the tiles in the Sales, Service, Marketing, Settings, and Help areas, and changed the background color for the rows of tiles to light gray. The greater contrast between the background and foreground colors makes the tiles easier to see and use.
For example, the new light gray background makes it easier to see the row of tiles for the different record types, such as accounts, contacts, leads, opportunities, and cases. Additionally, it's easier to read the names for the groups of tiles, for example: My Work, Customers, or Sales.
The greater contrast makes it easier to read the names of records you viewed recently.
To see an example: On the nav bar, click or tap Sales and then click or tap Accounts. Click or tap the down arrow on the Accounts tile to see the new lighter background for recently viewed records.