An overview of all the phobias I have already created environments for:

fear of being bound
(notes: adjust the lighting to add more tension, reference http://www.viz.tamu.edu/courses/viza643/11fall/light.htm )

fear of chins
(notes: make the stalactites a little more obviously chin shaped)

fear of making decisions
(notes: make each of the creatures look different, add more "indecisiveness" to the environment)

fear of swallowing
(notes: make the bug spikier)

fear of gaiety