When I found the original Piranha theme I loved the blue active theme and the crisp icons, but not the greenish inactive area and those icons seems murky to me.
SO.. after some work on the inactive, I have come up with what I believe to be an awesome theme - PrianhaII
Thick borders, founded corners, Blue active and Grey inactive and works well on both dark background as well as light.
Enjoy
Dark:

https://i.postimg.cc/Gp5fnMdp/Screen-Sh ... -10-37.png

https://i.postimg.cc/7L9x1r3W/Screen-Sh ... -10-44.png

https://i.postimg.cc/CxVYWxJ2/Screen-Sh ... -10-45.png
Light:

https://i.postimg.cc/RC6WmqQC/Screen-Sh ... -10-39.png

https://i.postimg.cc/QMF37KMH/Screen-Sh ... -10-43.png

https://i.postimg.cc/XNf09bnc/Screen-Sh ... -10-43.png

https://i.postimg.cc/fRFP62wR/Screen-Sh ... -10-41.png