The "clear" theme was integrated in Piwigo quite a long time ago. It comes back in piwigo.org extension manager to make it "installable" with the new 2.1 theme manager added inside Piwigo administration.
Revision 2.9.5 8353 Downloads, Released on 2019-04-09
Compatible with: 11, 2.10, 2.9
same as Piwigo 2.9.5
Revision 2.9.4 2304 Downloads, Released on 2018-07-13
Compatible with: 2.9
same as Piwigo 2.9.4
Revision 2.9.3 1989 Downloads, Released on 2018-02-26
Compatible with: 2.9
same as Piwigo 2.9.3
Revision 2.9.2 1842 Downloads, Released on 2017-10-06
Compatible with: 2.9
same as Piwigo 2.9.2
Revision 2.9.1 1429 Downloads, Released on 2017-06-15
Compatible with: 2.9
same as Piwigo 2.9.1
Revision 2.9.0 940 Downloads, Released on 2017-05-02
Compatible with: 2.9
same as Piwigo 2.9.0
Revision 2.8.3 2671 Downloads, Released on 2016-11-22
Compatible with: 2.9, 2.8
same as Piwigo 2.8.3
Revision 2.8.2 1870 Downloads, Released on 2016-07-08
Compatible with: 2.8
same as Piwigo 2.8.2
Revision 2.8.1 1582 Downloads, Released on 2016-05-04
Compatible with: 2.8
same as Piwigo 2.8.1
Revision 2.8.0 1042 Downloads, Released on 2016-03-08
Compatible with: 2.8
same as Piwigo 2.8.0
Revision 2.7.0 1606 Downloads, Released on 2014-09-25
Minimalistic template, with clear colors by default (light gray). Presentation is different from template "default" particularly on comments presentation : more space between comments. This template is (in author opinion) more adapted to galleries with long user comments.