I think both of your splashbacks look fine - in fact I really like them both, I think the green/blue splashback suits both of your other colours cabinets/tiles perfectly , but I can relate to that immediate "Oh sh!t reaction!" because I had it too with a few things in my house.
I am still second guessing my front door colours, but I think when things are unfinished you don't get the overall effect of the completed look.
I am waiting patiently until my front decking, driveway, front fence and landscaping is in.
If I still am unsure about the doors I will change them then
I consider myself lucky that my 'oh sh!t' moments are all for cosmetic things that can be changed easily enough, not big structural things...