Minimal and uncluttered spaces tend to get all the credit for being calming, but some people just don't have minimalism in their genes. In fact, for certain people, having lots of things is actually quite comforting and relaxing and not overwhelming at all. Obviously, "overwhelming" is going to be a different threshold for everyone, so you may not love all these spaces, but hopefully they can be an inspiration for how a home can be full while still being cozy and calm.
In Jason Grant's home (above), even the ceilings are fair game for display. Macrame mixes freely with oars, a yellow chair is friendly with a pink flamingo, and items from different time periods mingle with ease. Because the room is so filled with light and open floor space, it feels like a comfortable space rather than a cramped one.