I do a lot of stuff on my DeviantArt account. And while most of it does involve a bunch of characters of mine who are from Sigil, I would say that they are mostly tangentially related to Planescape.
http://avengingkobold.deviantart.com/art/Negotiations-in-Colour-140147175
This is one of drawings that is more directly related to Planescape as it involves my characters meeting face to face with Shemeshka the King of Crosstrade, with a mention of Xideous, and the wretched Colcook (aka Jemorille the exile) in the picture.