Several textile artists are planning prize drops during SDCC:

•  Grumpy Skittles Studio hosts an art drop during SDCC, from Wednesday through Sunday. Follow @PlushiesPop on Twitter for clues to the drop locations during the con.
• The Geeky Hooker returns with their annual crochet art drop. Follow @GeekyHooker for hints during SDCC.
• @shozumi is also planning a crochet drop on Twitter.
• @niftyneuron is using the tag #CrochetDrop for their prize drops.