Most themes paint every element one colour. A multicolour theme is different: it carries a palette of several colours and gives each branch of your diagram a different one, the way a rainbow mind map tints each main branch a distinct hue. They are perfect for mind maps, org charts, and any diagram where colour helps you tell one limb from another.
What They Are
A multicolour theme holds an ordered palette of colours plus a neutral trunk colour. Branches cycle through the palette, so a diagram with more branches than colours simply repeats hues rather than running out. The backdrop (the canvas background and pattern) works exactly as it does for any other theme; only the element colours change with the branch.
livediagram ships three multicolour themes in the Tab Style dialog: a saturated Rainbow spectrum, a soft Pastel version and a bright, summery Tropical palette. A tab saved on the retired Autumn or Jewel themes opens on Tropical or Rainbow, with any colours you picked yourself kept.
How a Branch Is Decided
livediagram works out the branches from your arrows. An arrow whose ends are both pinned to elements defines a parent-to-child link. The roots of the hierarchy (the centre of a mind map, or the top of an org chart) take the trunk colour, and each of a root's direct children starts a fresh branch hue that flows down the whole subtree beneath it. So a top-level limb and all of its sub-topics share one colour.
Elements that no arrow touches each pick up the next colour in turn, so even a flat board of scattered shapes gets a spread of hues rather than collapsing to one. Shapes caught in a loop with no root (A to B to C and back to A) take the trunk colour, since a loop has no natural limb. Arrows take the colour of the branch they feed into, so each connector matches its limb.
Adding to a Multicolour Diagram
A brand-new element you drop on a multicolour tab is not wired into the hierarchy yet, so it takes the neutral trunk colour. Once you connect it in with an arrow, give it the limb's hue by painting a neighbour's look onto it with the Format Painter. (Re-picking the theme does not do it: by then the trunk colour counts as one you chose, so it is kept.) A mind-map node you add from the keyboard is the exception: it copies its sibling's look, so it arrives in its branch colour. This is deliberate: livediagram does not silently re-rainbow your whole canvas every time you draw an arrow, which would fight any hand-colouring you have done.
Each theme card previews a small diagram in that theme's colours. On a multicolour theme each node of the preview wears a different hue, so you can spot the rainbow themes in the picker at a glance.
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