Read about the many Solid sulfur allotropes; here are lecture notes and the slides used in class.
View the NOAA video of submarine brimstone volcano and read about the generation of S2 by retro Diels-Alder reaction and about the synthesis of S4N4 in: Inorg. Synth. 33, 196-199.
Further resources: the interactive crystal structures of S10 and S12, interactive molecular orbitals of S4N4, a reading on the Crystal structure of S4N4, older lecture notes.
Here are some supplemental exercises and an interesting reading on the Molecular spectra of sulfur molecules and solid sulfur allotropes.