Triangle centre fractals

[pjt33]

This is one of a (potentially very large) series I've started work on which uses triangle subdivision at a triangle centre. Since there are over 5000 documented centres, it could potentially be a large project...

The image I've posted above alternates between subdividing at X19, the Clawson point; and X63, its isogonal conjugate. I have a gallery of some other single centres or pairs of centres, although it's still early stages and I need to improve the numerical accuracy for some of them.

I'm quite new to IFS, so I'd welcome suggestions on how to colour these. Note that I'm drawing lines rather than points, which restricts the options somewhat.