Just by eye Chris, Always build from a background & tweak it first (adjust the color & temperature or remove a site specific watermark) Then find an appropriate gtk, openbox or in this case, a cinnamon theme, which I then adjust as well to better match the wall. For my color schemes, I use gcolor2 to select a color from the wall for colors 0–>6 and use this site to create a pleasing gradient (generally, choosing every other color for contrast between them and selecting light–>dark (for dark theme) or the other way around for a light theme. I repeat the process for colors 7–>15 but start with a color from the gtk, openbox or cinnamon theme. By doing so, thee’s a pleasing array of colors when cli apps are open.
Sorry for the long winded answer but that’s the method to my theming madness