I think I've a fair variety in my fandoms.
In order of appearance -
ER, The man from UNCLE (series), NCIS, Without a Trace, CSI New York, Torchwood, NCIS Los Angeles, Hercules: The legendary Journeys, The Doctor Blake Mysteries, Holby City, Space 1999, and now I've circled back to CSI NY.
Some of them were only one shots, or rather, I only finished one fic in the fandom, and I did do crossovers with Quantum Leap and Supernatural. Also did a remix fic for Hawaii Five-0 a good few years back.
Febuwhump sounds like fun! As if I needed an excuse to whump my characters,