pixels.crd.co
a huge collection of tiny pixels and favicons, one of my favorite libraries

bonnie's graphic collection
contains pixels and graphics of any range, has a lot of miscellaneous favicons

finns pixels | resource rentry
has pixels, graphics, and dividers, organized in rainbow order. they also have a page of useful links that can lead you to even more helpful pages for css or decorating your site.

pixel soup
just a huge soup of pixels.

homuhoard
homuhoard is also another neocities site, organization is easy, they have a lot of pixels of any size, stamps, and the aesthetic is generally really colorful and cute.

NICE favicon masterpost
the biggest favicon dump!! mb it's just my internet, but it took a while to load this whole thing...

pixel-utopia tumblr (my favorite)
favorite place to get pixels!! i love this blog so much. you can also find a lot of other pixels, favicons, or background decor on old tumblr blogs

if you are looking for the link to the gyaru or gal pixels, i'm sorry to say i don't have an exact link... most of them i find on tumblr through looking up #gyarupixels or pixel gals, etc.