I'm sorry I don't have a pattern for these little (about 2"X2") letters and heart. I crocheted them out of jute gardening twine using chain and slip stitches. The J Hook worked nicely.
For the I and U, I placed a dot of glue and inserted a succulent cutting into each widened stitch. Leaves were used to trim the heart and rosette cuttings were used to fill it.