If you create a pattern make sure you are not violating any trademark or copyrights. For example, uploading a pattern of the Harley Davidson emblem is a no-no. Disney characters, School mascots, College mascots, NFL, NASCAR, NHL, MLB, NBA and some celebrity images, etc... are all on the forbidden list.
You can create any pattern you want for your own use. But if it violates trademark or copyrights do not post it here or there will be big problems.
Russ