Sulphur can be used to kill ticks, but generally you’d scatter it on your lawn. Never heard of it being applied to clothes - permethrin is a much better solution.
Sulphur can also be used to fumigate for pests. A product called a “sulphur candle” is marketed in the UK for this purpose - it’s just a tin of powdered sulphur with a cardboard wick. You’re supposed to use it to clear out all the bugs in a greenhouse.
If melted, sulphur can be used to make very dimensionally accurate castings. I’ve used a melted sulphur candle to cast internal threads for an accurate measurement of the thread profile. You can apparently use it to take castings of footprints made in snow, if you’re into forensics. You can also apparently use it to seal metal posts into holes in concrete, although this may have corrosion issues.
Sulphur can be used for a few nifty science demonstrations. Molten sulphur dropped into water forms “elastic sulphur”, a rubber-like material. Unfortunately it soon loses its elastic properties. If sulphur is mixed with iron filings and water is poured on top, it will begin to steam and melt from the exothermic formation of iron sulphide. Pile dirt on top and you have a neat model volcano.
A more energetic version of the sulphur-iron reaction is the sulphur-zinc reaction, that has been exploited by amateur rocketeers to make solid rocket motors.
Finally, there’s always the home gunpowder industry, if your room mate was into that sort of thing. Rather frowned upon these days!