6.4
10   Apr 28 2020
10 the best
Dracula Kde

Plasma Window Decorations
by phantom1009

5.7
9   Apr 28 2020
9 excellent
Ambiance Crunchy

Gnome Shell Themes
by frombenny

5.9
10   Apr 24 2020
10 the best
7.1
9   Apr 20 2020
9 excellent
Vantabright

Cinnamon Themes
by Brahimsalem

6.4
9   Apr 16 2020
9 excellent
Zen XFWM Theme

XFCE/XFWM4 Themes
by krig

6.3
10   Apr 16 2020
10 the best
7.1
10   Apr 13 2020
10 the best
6.4
10   Apr 11 2020
10 the best
6.3
9   Apr 10 2020
9 excellent
7.8
10   Apr 07 2020
Nice!
Moe Layout

Latte Layouts
by jomada

8.3
10   Apr 07 2020
10 the best
6.9
10   Apr 06 2020
10 the best
6.9
10   Apr 05 2020
10 the best
xplastic color theme

Plasma Color Schemes
by deny26

6.3
10   Apr 05 2020
10 the best
7.0
10   Apr 05 2020
10 the best
Unity8-Wood

Gnome Shell Themes
by Brahimsalem

7.1
9   Apr 04 2020
9 excellent
OpsXL

XFCE/XFWM4 Themes
by Boomzoomer

7.1
10   Apr 04 2020
10 the best
QPlatinum

Plasma Color Schemes
by zinjanthr0pus

5.8
10   Apr 03 2020
10 the best
Aqua

Cinnamon Themes
by Brahimsalem

5.3
9   Apr 03 2020
9 excellent
IndigoMagic

XFCE/XFWM4 Themes
by davem82

8.0
10   Apr 02 2020
I don't know about modern, but there is wonderfull skeuomoprh UI