An option is to build the case entirely of colored squares with a flower on a complementary or contrasting color on top. This is an example of different types of flowers and on the right is a single square.

The squares could be of different type of yarns which would give variety to their size and textures

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Mural instead of i phone case: Another option is to play with scraps of fabric as the main focal point and add embroidery, crochet and doodles as accents through out.