Pastel Hairs offers a selection of paler hair colours for greater hair diversity, they also tend to have less bleed than directly prompted colour. Use them with your hair prompt, like "PastelOrange2 hair" or "PastelBlue3 ponytail". Rearranging their position in the prompt can affect the tone, if too pale move them closer to the start of the prompt.
They won't work with all models and paler versions are more prone to failure, it can't be helped.
They can also be applied to eyes for interesting results.
I often use ambiguous colour prompts such as "pastel" or "vibrant" to give more variety to output and I find this generates some amazing colours, which there is no way of prompting for directly. Stable Diffusion lacks colour vocabulary. This is an attempted work around, maybe I'll continue the project in the future with other palettes. Theoretically the colours should apply to anything but I can only get them to work with hair and less well with eyes.