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 8334 Downloads, Released on 2019-04-09
Compatible with: 11, 2.10, 2.9
same as Piwigo 2.9.5
Revision 2.9.4 2284 Downloads, Released on 2018-07-13
Compatible with: 2.9
same as Piwigo 2.9.4
Revision 2.9.3 1969 Downloads, Released on 2018-02-26
Compatible with: 2.9
same as Piwigo 2.9.3
Revision 2.9.2 1821 Downloads, Released on 2017-10-06
Compatible with: 2.9
same as Piwigo 2.9.2
Revision 2.9.1 1409 Downloads, Released on 2017-06-15
Compatible with: 2.9
same as Piwigo 2.9.1
Revision 2.9.0 922 Downloads, Released on 2017-05-02
Compatible with: 2.9
same as Piwigo 2.9.0
Revision 2.8.3 2653 Downloads, Released on 2016-11-22
Compatible with: 2.9, 2.8
same as Piwigo 2.8.3
Revision 2.8.2 1852 Downloads, Released on 2016-07-08
Compatible with: 2.8
same as Piwigo 2.8.2
Revision 2.8.1 1560 Downloads, Released on 2016-05-04
Compatible with: 2.8
same as Piwigo 2.8.1
Revision 2.8.0 1020 Downloads, Released on 2016-03-08
Compatible with: 2.8
same as Piwigo 2.8.0
Revision 2.7.0 1582 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.