I’ve never actually been in a church where the color of the carpet was an issue, but the topic stands in for a host of other topics when people are discussing superficial things they don’t like about a particular place of worship.
Still, there are some superficial environmental details which impact how effective ministry can be. For example, why is sometimes the pastor seems to really connect with people during the sermon, and other weeks when people are less responsive. It may have to do with things you don’t think about.
It’s very true that the “intangibles” can make a huge difference. Paul lists four things you may or may not notice that can dramatically affect a congregation’s engagement. Check it out here.