I looked for drawer dividers, but wasn't keen on spending upwards of $40 per divider for wooden dividers. I mean really, who is ever going to see them? There were also white plastic ones for $20 or so, but they weren't all that nice.
So, I got crafty with the most basic supplies available:
I measured the cardboard for the length of the drawers and had some extra shelf-lining paper from a dresser proejct, which I used to cover the cardboard.
The cardboard I used (from a packing box) is sturdy enough to stand up in the drawer, especially when supported by drawer items. I then inserted the "divider" in my drawer, et voila! no more mixed up socks and tights!
I made them for each drawer, and although an incredibly simple solution, they really make life in 2 drawers easier. Total cost...hmm I don't know, $0.07? Total time - for all 4 - about 1/2 hour.