It’s done!
I’ve created a little fork of communitheme that you can use to make the titlebars white - essentially this is like a sane version of radiance. Will be based on Adwaita of course but that will be a minor change (Will be done tomorrow).
To use it, you’ll have to do the following (BACKUP the files before doing this):
/* Add the following to the end of
admin:///usr/share/gnome-shell/theme/communitheme/gnome-shell.css: */
/* TOP BAR */
#panel {
background-color: rgba(255, 255, 255, 0.25);
box-shadow: 0 3px 3px 4px rgba(0, 0, 0, 0.2);
/* transition from solid to transparent */
transition-duration: 500ms;
font-weight: 450;
height: 1.86em; }
#panel.unlock-screen, #panel.login-screen, #panel.lock-screen {
background-color: transparent; }
#panel #panelLeft, #panel #panelCenter {
spacing: 4px; }
#panel .panel-corner {
-panel-corner-radius: 0;
-panel-corner-background-color: rgba(255, 255, 255, 0.35);
-panel-corner-border-width: 2px;
-panel-corner-border-color: transparent; }
#panel .panel-corner:active, #panel .panel-corner:overview, #panel .panel-corner:focus {
-panel-corner-border-color: #eb6637; }
#panel .panel-corner.lock-screen, #panel .panel-corner.login-screen, #panel .panel-corner.unlock-screen {
-panel-corner-radius: 0;
-panel-corner-background-color: transparent;
-panel-corner-border-color: transparent; }
#panel .panel-button {
-natural-hpadding: 12px;
-minimum-hpadding: 6px;
font-weight: 450;
color: #F7F7F7;
text-shadow: none;
text-shadow: 0px 1px 2px rgba(0, 0, 0, 0.7);
transition-duration: 100ms; }
#panel .panel-button .app-menu-icon {
-st-icon-style: symbolic;
margin-left: 4px;
margin-right: 4px; }
#panel .panel-button .system-status-icon,
#panel .panel-button .app-menu-icon > StIcon,
#panel .panel-button .popup-menu-arrow {
icon-shadow: 0px 1px 2px rgba(0, 0, 0, 0.4); }
#panel .panel-button:hover {
color: white;
text-shadow: 0px 1px 2px rgba(0, 0, 0, 0.4); }
#panel .panel-button:hover .system-status-icon,
#panel .panel-button:hover .app-menu-icon > StIcon,
#panel .panel-button:hover .popup-menu-arrow {
icon-shadow: 0px 1px 2px rgba(0, 0, 0, 0.4); }
#panel .panel-button:active, #panel .panel-button:overview, #panel .panel-button:focus, #panel .panel-button:checked {
background-color: rgba(0, 0, 0, 0.01);
box-shadow: inset 0px -3px #E95420;
color: white; }
#panel .panel-button:active > .system-status-icon, #panel .panel-button:overview > .system-status-icon, #panel .panel-button:focus > .system-status-icon, #panel .panel-button:checked > .system-status-icon {
icon-shadow: none;
/*black 0 2px 2px;*/ }
#panel .panel-button .system-status-icon {
icon-size: 1.09em;
padding: 0 5px; }
.unlock-screen #panel .panel-button,
.login-screen #panel .panel-button,
.lock-screen #panel .panel-button {
color: white; }
.unlock-screen #panel .panel-button:focus, .unlock-screen #panel .panel-button:hover, .unlock-screen #panel .panel-button:active,
.login-screen #panel .panel-button:focus,
.login-screen #panel .panel-button:hover,
.login-screen #panel .panel-button:active,
.lock-screen #panel .panel-button:focus,
.lock-screen #panel .panel-button:hover,
.lock-screen #panel .panel-button:active {
color: white; }
#panel .panel-status-indicators-box,
#panel .panel-status-menu-box {
spacing: 2px; }
#panel .power-status.panel-status-indicators-box {
spacing: 0; }
#panel .screencast-indicator {
color: #F89B0F; }
#panel.solid {
background-color: #E8E8E7;
/* transition from transparent to solid */
box-shadow: 0 1px 1px 1px rgba(0, 0, 0, 0.4)!important;
transition-duration: 1000ms; }
#panel.solid .panel-corner {
-panel-corner-background-color: white; }
#panel.solid .panel-button {
color: #000;
text-shadow: none; }
#panel.solid .panel-button:hover {
color: #000; }
#panel.solid .system-status-icon,
#panel.solid .app-menu-icon > StIcon,
#panel.solid .popup-menu-arrow {
icon-shadow: none; }
/* Add the following to the end of
admin:///usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/stylesheet.css: */
#dashtodockContainer {
background-color: rgba(255, 255, 255, 0.2)!important;
}
#dashtodockContainer .notification-badge {
/* Change the background here to whatever your variant of Adwaita-Ubuntu uses */
background-color: #23A5D4;
}
#dashtodockContainer.running-dots .app-well-app.focused .overview-icon, #dashtodockContainer.dashtodock .app-well-app.focused .overview-icon {
/* Make the current app indicator dark */
background-color: rgba(0, 0, 0, 0.2);
}
#dashtodockContainer #dash {
/* Make the dash white by default */
background-color: rgba(255, 255, 255, 0.2)!important;
}
#dashtodockContainer.opaque {
background-color: rgba(255, 255, 255, 0.8)!important;
}
#dashtodockContainer.transparent {
background-color: rgba(255, 255, 255, 0.1)!important;
}
Instructions are also in the Github repo. I will obviously create a real adwaita theme out of this in the future as this is a working (Even transparency changes work) but quite ugly solution 
Below are some screenshots from the different variants:
I personally start to really like the blue version with adwaita/suru icons now as well, especially when highlighting things and in the context menu, it does indeed look … fresh, like the light water on a tropical island’s beach 
What do you think about it? This is a very minimal edit and especially when used with Adwaita it could be done with less then ~20 LOC.
