Good morning everyone!
If you are looking for an easy way to use up sock yarn, check this site out. It is at Mason Dixon Knitting. Just pay attention to the 4" square. Being that I have no sense of what 4" is (my first square ended up 6"), I hacked off the end off a 6"x4" index card and stuck it in my bag. Your gauge can be whatever in order to get a 4" square and then send them off . . . spread the word!
Have a good one.