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Well, the thing is, I wanted to change my flooring, but the thing is, i visited 'my things', but i couldn't find anything so i'm practically stuck with the one i have now and i don't want to buy another one
It's not in your 'my things'. That's why you can't find it.
Wallpaper/flooring is not interchangeable. When you buy a new one it simply replaces the old one. You do not get to keep it.
Think of it like real flooring and wallpaper. You don't get the keep the old wallpaper when you redecorate your room.
when you buy another flooring or wallpaper, you can't change to the one you had before, you must buy it another time, then, if you want to have the same one as before.