By invitation only, several hundred artists create original artwork on Post-it Notes for a special gallery event in December each year. I've participated since 2015. It's an amazing event, I encourage everyone to check out the gallery's Instagram (@giantrobotstore) or blog for updates!
Post It Show Thirteen (2017): Heraldic Animals and Animal Wordplay
Post It Show Twelve (2016): Spirit Animals and Unicorn Love
Post It Show Eleven (2015): Poetry of Pattern
All artwork rendered in brush and inks.