I was going to take your flower idea today!!! What a cool thing to do for yourself!!
I think anything we do differently can cause our H's to take notice....the flowers seemed to get his attention! Interesting tho, that your H said about S7 being disturbed....did YOU get that impression from S7, or was it H projecting....
If it bothers S7, then I would check in with him. It may also be a seeds thing planted by H, questioning S7 about the flowers.....I remember there were times my kids weren't concerned about things until xh told them they should be. Grrrrrrr. He would say things like, "doesn't that BOTHER you????" And "you mean you don't think that's ODD??" Oh, he was great at building their sense of security. Not. Then the kids would second guess their original response, and change their opinion.
But, if it was just H fishing....eh. Let him wonder. You have better things to do!