No matter how many ways I try the prompt I've never gotten a repeating seamless pattern. Sometimes it's really close. So close I don't notice that parts of it don't align on one side. Other images are just not following the prompt at all to make a repeating pattern. These are the types of patterns you'd use on wallpaper or wrapping paper.
Eg. prompt I used.
"A seamless repeating tileable pattern; cute hyper realistic looking cartoon sloths in a jungle background; for printing on fabric, wallpaper and other packaging and textiles"
At times this one almost created a seamless pattern, but when I went to tile it, things were slightly off. I've included examples.