A kanji consists of multiple radicals. Generative Kanji is generated by two radicals, 「hen」 and 「tukuri」.
This is similar to how the word "recycle" constructs a new meaning from 「re」 and 「cycle」.
Some of the generated kanji may be real, some may be fictitious. I have notated the meanings of the radicals, so please use your imagination and have fun.