Rounded-Dark theme I have created which suits the best for circled-icons, the source-code is available at GitHub : #-Link-Snipped-#
You'll need plank dock(comes pre-installed in #-Link-Snipped-#), which you can install from #-Link-Snipped-#

Installation :
Download source-code & extract the zip/tar file
Move the extracted files i.e dock.theme & hover.theme in /usr/share/plank/themes
Open tweak-tool & select the installed theme.

On side note:
If anyone of you're working on any project related to C, ArduinoC, Qtcurve themes, Plank themes & Conkys; then kindly link your Github url below in comments, as I would like to fork some of your projects.