Making the colours
Generate makes every colour of the theme from two you choose, so they belong together: the links, the creatures, the speech and the channels all from one seed, each readable on the ground.

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Seed: a colour whose hue the theme is built round. Its lightness and strength set how bright every colour is. Click the swatch to choose one.
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Seeds from: the vivid colours of the theme you started from, offered as seeds. A click makes one the seed.
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Background: what every colour must read against. A light one makes a light theme.
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Scheme: how the colours spread round the colour wheel from the seed:
Scheme monochrome one hue, varied lightness and strength analogous neighbours: calm, low contrast complementary opposites: a strong pairing split softer than complementary triadic even thirds: vivid, balanced tetradic two complementary pairs golden the golden angle: the most separation compound an analogous pair, and its opposite -
Spread: how far the scheme’s colours sit from the seed’s: 0.7 close, 1.4 far.
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Contrast: how readable every colour must be on the background: 3 is low, 4.5 the usual floor, 7 high.
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Separation: how different two colours of one group must be, so two channels, or health and stamina, never look alike: 0.04 low, 0.09 medium, 0.15 high.
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Room plate: the room name’s contrast on the plate under it: 2.5 subtle, 7 hard.
Some colours mean something by their hue, and keep it whatever the seed: health is red, mana blue, a warning amber, a creature’s spell coming orange. The generator moves only their lightness, to suit the background.
Over Despana the dials do nothing
Despana pins every colour as it is, and a theme laid over Despana takes its pins: the dials change nothing there. To make a theme from a seed, set over to nothing, or Start from Light, which is generated. Every colour you have not pinned is then made by the generator.