Here are my completed Sockapalooza socks. I hope my pal likes them as much as I do.

There were a couple of knots in the second skein but I think I concealed the joins pretty well. Also, the lace that goes down the sides of the instep are reversed because I can't tell my left from my right. Well, that's not quite true: I put the left-hand lace on my left side, as I knit, instead of the sock's left as it would be worn. The result is that the bottom lace doesn't flow as nicely from the top as it should. I only noticed this when halfway done with the second sock, of course, so it became a feature instead of a bug, as they say.

My question is, what now? What do I do with the socks? Wash them or not? And since this is my first exchange, what do you suggest I include in the box? I know that nothing else is required, but what are some typical goodies that get sent to pals? And should I include the leftover yarn for her in case she needs it?
Thanks so much for your help along the way.
One more shot:

Pattern: Fools Rush Socks by Cassie of Too Much Wool
Yarn: Jaeger Matchmaker in burgundy
Needles: Addi Turbos, size 0