Artwork — When I started the site in 1998 I was using Victorian spot art illustrations (Examples: 1, 2). They're one of the few (maybe only) design elements that have survived to the present; amazingly, they still "fit". But I'm still using the original scans, because I lost the Dover art book I got them from. Just recently I finally ordered another copy.
The plan is for Jess to paint & ink her own watercolor versions of the same sketches. We've talked about doing this for a couple years now. I'll probably leave the originals in place on very old posts (the ones that predate the 2012 redesign) and update newer ones with fresh, colour, retina-quality artwork.
My current idea is to make sure each series & project has an associated image and display these along each one in the listing, with perhaps a fuller "short" description. In general I avoid adding artwork as a required step in my creation process because realistically it just means I would never publish anything. But I add new series and projects rarely enough (and after enough long consideration) that the added work would be worth it.