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 8327 Downloads, Released on 2019-04-09
Compatible with: 11, 2.10, 2.9
same as Piwigo 2.9.5
Revision 2.9.4 2281 Downloads, Released on 2018-07-13
Compatible with: 2.9
same as Piwigo 2.9.4
Revision 2.9.3 1966 Downloads, Released on 2018-02-26
Compatible with: 2.9
same as Piwigo 2.9.3
Revision 2.9.2 1817 Downloads, Released on 2017-10-06
Compatible with: 2.9
same as Piwigo 2.9.2
Revision 2.9.1 1405 Downloads, Released on 2017-06-15
Compatible with: 2.9
same as Piwigo 2.9.1
Revision 2.9.0 917 Downloads, Released on 2017-05-02
Compatible with: 2.9
same as Piwigo 2.9.0
Revision 2.8.3 2648 Downloads, Released on 2016-11-22
Compatible with: 2.9, 2.8
same as Piwigo 2.8.3
Revision 2.8.2 1846 Downloads, Released on 2016-07-08
Compatible with: 2.8
same as Piwigo 2.8.2
Revision 2.8.1 1557 Downloads, Released on 2016-05-04
Compatible with: 2.8
same as Piwigo 2.8.1
Revision 2.8.0 1017 Downloads, Released on 2016-03-08
Compatible with: 2.8
same as Piwigo 2.8.0
Revision 2.7.0 1580 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.