Aside from stuff for the seasonal sales, Valve doesn't really make point shop items themselves. A vast majority of what's on the points shop is provided by devs, so you would have to ask individual devs.

As long as it only effects that users profile who purchased it.

Points store icons and themes is based on the Games we own.
So if you own a game with rainbows .

引用自 Jaunitta 🌸：

Points store icons and themes is based on the Games we own.
So if you own a game with rainbows .

They are not based on anything, they are whatever the developers decide to add.