I did try port the old gnant theme to newest linux mint. This process took me 3 hours. Missing icons are possible.
I ' ll add some few in future. It was not so easy to find all the icons somewhere hidden in the net. gant theme for xfce was a big help b.t.w. . But this theme is another approach for mint and does support mint start menu, gtk3 apps etc.
Credit goes to its original author at deviantart.com and to all the persons who did create themes from it.
Free for personal use. For other use ask the original develloper at deviantart.com .