"Patterns up on" can be replaced with various synonyms to make your writing more interesting and diverse. Some of the synonyms for this phrase include "emerging," "appearing," "taking shape," "forming," "developing," "arising," and "manifesting." For example, instead of saying "the design patterns up on the fabric," you could say "the design is emerging on the fabric," or "the patterns are taking shape on the fabric." Using synonyms adds more flavor to your writing and helps you avoid repetition. It also allows you to convey your ideas more effectively and helps your readers better understand the message you are trying to convey.