morijandrostark - Star Trek, Sherlock, RDJ, Doctor Who, queer/trans/female rights, etc.
saint-cheshire - British television, general hilarity, literary references, etc.
ilovedessert - uhmm. I'm just a glutton, not gonna lie.
sashkash - really fun style of Sherlock fan art
breakfastatthetardis - Doctor Who, Sherlock, Harry Potter, etc.
completelycumberbatched - mostly Benedict Cumberbatch, BUT OTHER STUFF TOO I PROMISE
babysong - a lot of things from a lot of fandoms and 99% of it is great.
deepasleep - both a Nerdfighter and just a great person with a really good blog so you should follow her right now
^ A fantastic collection of things that are excellent.
I've spend a few minutes realizing I follow 200 people and I can't even just pick out 5.
I have two absolute favorites. One would have to be Relique Memoirs. The combination of pictures, background, and theme music makes for a fantastically beautiful tumblog. Being a fantasy writer, I frequently...frequent (<.<) her blog for inspiration, and I'll write to her theme music. :) The other is Valp's Desk. Valp, or Valentine Pasche, is a Swiss artist. I believe she hails from Geneve--I'm not sure. Anyway, she fancies Gothic, steampunk, vintage, fantasy, sci-fi, and nature, judging by her tumblog. Hers is another place I go for inspiration. For a look at some of her artwork, she's also on DeviantArt. But, yeah, those two are my all-time favorites! I have others I like, but those are the big ones for me. :D