R1:9ef0ea91c4a2

Remove dust pattern for common bg color.

Summary: Depends on D6769, removes 'dust' and uses a similar color background.

Test Plan: Review colors in sandbox.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D6772