There was a list of indexes somewhere around here on the forum. However all the ones above 7 are actually an overflow, technically speaking, so the game starts reading from another address section, instead of the dedicated colors address in the memory. This means that the high indexes can be pretty unreliable and might look different on different computers. The very high ones (like over 200) are all black because they are probably read from a zone of memory that is full of zeroes.
You can, however, use the colours.bin editor to edit the original 8 colors and use those instead, but this means you'll have to use it with the original houses. This was also somewhere on the forum, but I can't really search now. It is available on our discord though, you could download it from there.