Re colour of wheel rims;
From the Skoda car configurator webpages;
If you spec a Yeti SE Drive (not an L) then standard rims are 17" Matterhorn's in grey & sliver with Matterhorn rims in black and silver listed as a £300 option.
If you spec a Yeti SE L Drive standard spec is 17' "Origami" (who thinks of these names?) and 17" Matterhorn rims in black and silver, again, listed as a £300 option.
Colour choice is very personal, one persons' "Oh wow" is another's "what the..." personal bias I would imagine that the standard 17" grey & silver Matterhorn rims on a SE would be a very complementary look with Quartz grey metallic paint. But it would appear that like yourself my personal preference with black bodywork would be to spec the optional black & grey Matterhorn's.
