I have the same problem with modern theming. Absolutely hate the flat, same-dark-color look. I need contrast. Unfortunately, the accessibility “contrast” themes that usually come with most DEs, are absolutely hideous and bare bones. What I need is a normal looking theme (round corners etc), but with a clear difference between title bars/widgets/menu bars in terms of colors. I could make my own back in the old days, but now that it’s all gtk+ API calls code, now it’s unnecessarily complicated.