Elle Stone has a collection of really nice profiles here:
She has a set of ProPhoto profiles with various gamut:
LargeRGB-elle-V2-g10.icc LargeRGB-elle-V4-g10.icc
LargeRGB-elle-V2-g18.icc LargeRGB-elle-V4-g18.icc
LargeRGB-elle-V2-g22.icc LargeRGB-elle-V4-g22.icc
LargeRGB-elle-V2-labl.icc LargeRGB-elle-V4-labl.icc
LargeRGB-elle-V2-rec709.icc LargeRGB-elle-V4-rec709.icc
LargeRGB-elle-V2-srgbtrc.icc LargeRGB-elle-V4-srgbtrc.icc