Currently it's possible to generate random clusters (formerly known as creatures), but unlike mandalas, there's no way to _edit_ one if you decide that there's something about it that you'd like to change. This means, for instance, that if a randomly-generated cluster looks nice but needs a hat, or if it has arms you don't like, or if you find something cool in the gallery but want to remix it a bit, you will be able to make those changes.
It also isn't currently possible to randomly generate a cluster with lots of complexity; the data structure to represent a cluster is defined recursively, however, so this editing UI--however horrible this initial version is--allows for the construction of clusters of arbitrary complexity.
Note that the UX for this is currently terrible, but we can improve on it in future PRs.
Atul Varma