Lorem and Ipsum - a couple of dopplegangers who've been converted to LG by a spell crit side effect on a high level spell cast by a Patriarch they were stalking, imitating some of his attendants. Now they've taken up honest work in the city as body doubles and stand-ins for the rich and powerful that have a need to be in two places at once.
Crafting: Slime trails - similar to DM Scotty's water, start with report cover or similar clear plastic, cut out irregular pieces and add goo with hot glue and stain color pieces in various greens, purples, pinks, or a mix. Could also try adding texture and color in one go by coloring some gloss medium paste and applying that.
While out for my morning walk, was thinking about implementing a system where magic emanations from spellcasting, some animal powers and some item effects are passively noticeable to the magically sensitive, even when the direct physical effects and casting cannot be seen or heard, in sort of a log scaled way. A cantrip is like a whisper in the magic ether, first level spell like a quiet conversation, second like a loud conversation, up to damaging ninth level spells being like a major artillery strike or volcanic explosion that will be felt miles away and out of line of sight by the sensitive. Checks made to understand more of what it was and the direction might be enhanced by detect magic or identify cast in reaction. Lots of opportunities there for foreshadowing and "convergences".