LibreOffice was capable of handling color palettes on its UI for a while already. In the meantime, the competition introduced document themes, which are a fixed set of 12 colors, to be attached to various parts of documents. This allows referring to those colors by name, and apply color filters. These color filters are maintained even if the source theme changes. Come and see how this now starts to work also in Impress, what still needs doing and how you can help.