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Colour fill layers only. I actually did this in PSP 7 on the fly but it is completely translatable to PS (it looks very, very, very slightly different and I've provided the icon done in PS 7 at the end). I'm quite confident that it is translatable to all other programs as well, but I don't have any others so I cannot provide samples of any variations that may occur.
Duplicate base - screen 30%
Duplicate base again - soft light 100%
#F5F2C7 - burn (colour burn) 81%
#37230B - screen 83%
#1B011B - exclusion 38%
#F6D6ED - burn (colour burn) 36%
#CEEEF6 - burn (colour burn) 60%
#2B2B2B - screen 40%
PS 7 result: