The phrase "blue rose" is often used to refer to a mythical flower that doesn't exist in reality. However, there are other terms that can be used to describe a blue-colored or blue-ish rose, such as lavender, indigo, periwinkle, sapphire, or even cornflower. These words add specificity to the description of a flower's color while still conjuring an image of an uncommon and rare bloom. While a true blue rose may not exist in nature, these synonyms help to capture the elusive and ethereal quality that makes the idea of a blue rose so compelling.