Designing aesthetic word clouds sometimes take quite a few iterations, especially if the phrases are quite long. Adding shorter "filler symbols" can make a cloud look better. You can specify any symbol (e.g. a heart, star) as the filler symbol for a cloud, you also specify how many you want, then the cloud machine adds these fillers into the design where space is available. You can use a set of different symbols and the machine will pick one by one.