I have to admit that I do a lot of the "random pretty girl" banners:

I have no clue who she is: she just came up in a google search for "Anime Music".
I used to make them more often, but I don't like doing them much anymore. I usually try to keep them music related (like playing guitar, or listening to headphones). I do have one of a girl at a computer - I added Sony Vegas to her computer screen - I also never expected it to be worthy.
I would say that most of mine are actually from fairly popular anime Shugo Chara, Zetsubou Sensei, Inu Yasha, Lucky Star (even though I don't like it), Air, Sailor Moon, Cardcaptor Sakura, Bleach, Full Metal Alchemist, Excel Saga, Magical Shopping Arcade Abenobashi, Pokemon, Death Note, Tokyo Mew Mew, Karin, The Melancholy of Haruhi Suzumiya, Ouran High School Host Club, Ghost in the Shell, The Girl Who Lept Through Time, FLCL, Spirited Away... etc (This is over the years)
Yotsuba isn't anime, but I love her so much I can't help using her XD. Kingdom Hearts isn't either, but I thought it was appropriate because KH videos are posted here.
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And Dino, I can see what I can do, but with as ugly as those drawings are, I don't think they really have a chance lol O: