Best wallpaper borders according to redditors

Chesapeake BYR94301B Dino Mighties Dinosaur Toss Wallpaper Border, Red https://www.amazon.com/dp/B00YEM65TK/ref=cm_sw_r_sms_apip_BjPYVMvxAlnZw

Here's a world map with accurate topography and very low-key borders.

Here's a quite nice watercolor map.

Here's a reproduction of an antique map of ocean currents and shipping routes.

Here's a map of famous flight paths around the world.

My Japanese is super limited, but here is the item on Amazon.co.jp: click

Its name is: 爽涼くまさんクールクッション Soryo (cool and refreshing) Kuma-San (bear) cool cushion. I'm not sure if Soryo is the brand name or just a descriptor, but it seems redundant to call the item cool twice lol.

The section labeled メーカー on the Amazon link is the manufacturer I think, since that says "Maker", but I don't know what the kanji there says so hopefully someone far more proficient than I can give you the manufacturer!

Edit: I can only see the manufacturer field on my phone and not on desktop for some reason. It says 株式会社丸辰 which Google translate says is Marubo Corporation, but I don't know if that's the correct reading.

Edit 2: The light blue rounded font says ひんやりの接触涼感生地 which is "cool touch, cool feeling fabric".

This championship banner has always been hanging up in my room: NHL Detroit Red Wings Wool Dynasty Banner https://www.amazon.com/dp/B0036GLK36/ref=cm_sw_r_cp_apa_kNFpzbRTH1D82

I'd also recommend getting a goal light like this: NHL The Goal Light and Horn with 30 Team Labels https://www.amazon.com/dp/B009P9Y4JA/ref=cm_sw_r_cp_apa_5QFpzbGD4MHDJ or something like that during games.

Fathead's are good poster replacements.

Jerseys are always a good idea.

And here's a redwings border for the top of the room:
Detroit Red Wings Licensed Wallpaper Border https://www.amazon.com/dp/B00NQAWBB2/ref=cm_sw_r_cp_apa_qXFpzbTQDRDJ3

Here is the mobile version of your link