When describing something as "most olive-brown", there are a range of synonyms that can be used to add more variety to your writing. Some alternative phrases might include "deep khaki", "rich mossy", "earthy sage", "warm sepia", "golden ochre", "rustic sienna", "toasted caramel" or "creamy hazel". Each of these phrases conveys a slightly different shade or tone, allowing you to create a more nuanced and descriptive picture for the reader. Experiment with different synonyms and see which ones best capture the essence of your subject.