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 8343 Downloads, Released on 2019-04-09
Compatible with: 11, 2.10, 2.9
same as Piwigo 2.9.5
Revision 2.9.4 2295 Downloads, Released on 2018-07-13
Compatible with: 2.9
same as Piwigo 2.9.4
Revision 2.9.3 1980 Downloads, Released on 2018-02-26
Compatible with: 2.9
same as Piwigo 2.9.3
Revision 2.9.2 1831 Downloads, Released on 2017-10-06
Compatible with: 2.9
same as Piwigo 2.9.2
Revision 2.9.1 1419 Downloads, Released on 2017-06-15
Compatible with: 2.9
same as Piwigo 2.9.1
Revision 2.9.0 930 Downloads, Released on 2017-05-02
Compatible with: 2.9
same as Piwigo 2.9.0
Revision 2.8.3 2661 Downloads, Released on 2016-11-22
Compatible with: 2.9, 2.8
same as Piwigo 2.8.3
Revision 2.8.2 1861 Downloads, Released on 2016-07-08
Compatible with: 2.8
same as Piwigo 2.8.2
Revision 2.8.1 1572 Downloads, Released on 2016-05-04
Compatible with: 2.8
same as Piwigo 2.8.1
Revision 2.8.0 1030 Downloads, Released on 2016-03-08
Compatible with: 2.8
same as Piwigo 2.8.0
Revision 2.7.0 1593 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.