A few! A note: I do like angst and dysfunctional relationships. If that's not your jam, the first two are less angsty.

Multi-femslash, I'm Your Man
https://www.youtube.com/watch?v=0cAb1OAb93w

Allison/Lydia (Teen Wolf) - Maybe it's the way she walked (song is a female cover of Best Song Ever)
https://www.youtube.com/watch?v=sndGw4fqFrM

Morgana/Gwen (BBC Merlin) - I can't be who you are (song is a female cover of Leave Out All the Rest)
https://www.youtube.com/watch?v=z6kuUF927Ks

Snow Queen (OUAT) - Haunted by Taylor Swift
https://www.youtube.com/watch?v=6TyHi0aEq3s

Swan Queen (OUAT) - Trouble by P!nk (does have slightly annoying voiceovers over the music, but still a fun vid)
https://www.youtube.com/watch?v=YZUabbo1N0I

And lastly, a tonne of Buffy/Faith because it's my OTP:
Still by Daughter
https://www.youtube.com/watch?v=Uk94C6DvtQE

Wonderwall vs Boulevard of Broken Dreams mashup
https://www.youtube.com/watch?v=wWbTHYL_4Do

Release me by Agnes
https://www.youtube.com/watch?v=Qi6DRoCLgos

Somebody That I Used to Know by Gotye ft Kimbra
https://www.youtube.com/watch?v=Au8jTyRuGEE

Personal Jesus by Depeche Mode
https://www.youtube.com/watch?v=QUDK4N3T8u8

Sail by AWOLNATION
https://www.youtube.com/watch?v=Sn4hYVUuZ90

Whispers in the Dark by Skillet (constructed reality vid where Faith takes Spike's place in s6)
https://www.youtube.com/watch?v=iQ3iSvYHof8

Blow Me (One Last Kiss) by P!nk
https://www.youtube.com/watch?v=nYEjXwUy0Cw

I Touch Myself by Lady Gaga (short vidlet)
https://www.youtube.com/watch?v=gqTsmfc-_20

All the Things She Said by Tatu
https://www.youtube.com/watch?v=Qi6DRoCLgos