So the deeper I've gotten into the world that is icon-making, I've been fortunate enough to come across really helpful resources (textures, brushes and scans to name a few), and since there's people working really hard, the 'least I can do is credit 'em.
In terms of pictures & scans, so far I've been using my own screencaps and pictures I've collected over severalseveral months (I can't trace these badboys back - I also had no idea I'd be making icons with 'em in the future), in that case. Starting from now, if I purposefully use other people's scans, I'll be sure to add them on this list as I do so (so this'll always be a work-in-progress it looks).
Rambling aside, here are my credits:
001 -
78777 002 -
aoi_sama896 003 -
bunny_icons 005 -
lifeisdolce 006 -
starlitdesigns 007 -
creamuts 008 -
boys_paper