Thanks for all the replies.
I've checked the BB website and they have mostly merino socks. The ones I looked at were all one-size.
A Suitable Wardrobe does have small sized socks, but they're mostly solids and solid-like patterns. $35 is also really pricy for socks.
I was actually at the anniversary event and talked to one of the guys at Jimmy Au's (but not about socks). The socks section on their website is "Coming Soon."
I've gotten some Viccel socks in the past before. The custom sizing is nice, but solids and ribbed patterns are too boring for me. Hopefully they'll add some more variety in the future.
I think the least important requirement that I have is that it's sized 7. As long as it fits and stays up, it doesn't really matter to me what size it's marked at. The main patterns I'm looking for are dark-colored argyles and possibly pindots.
I've tried these
Marcoliani argyles from Howard Yount but they do not stay up at all. Surprisingly, the best socks I've found so far are certain pairs of Target socks that there was a thread about a while ago. Even after several washes, they've retained their structure and elasticity. Strangely, not all of the pairs I bought from Target have stayed in good condition.