I was running Wheezy using Gnome Fallback on my laptop for a long time and recently wiped it and installed Stretch and MATE. I am not a fan of Gnome Shell and similar desktops which is why I chose MATE. I was surprised that the Adwaita theme in Stretch is a hacked version of Clearlooks (GTK-2) and it does not use GTK-3 at all. This laptop is utilitarian, I use if mainly for coding and business stuff for my construction company. I really like the older Gnome Adwaita GTK-3 classic and fallback themes so I hacked up a MATE GTK-3 theme TraditionalGreen into what I call TraditionalGray. This is a MATE theme. Feel free to try it out and let me know what you think.