Grells are badass monsters. Ever since I bought the bendy wire-framed Grell figure back in the day (and then learned true DnD Grells didn't have eyes, but oh well) I've had a fondness for them (and Neo-Otyughs, but that's neither here nor there). I always thought the Grick from the Monster Manual was meant to be some sort of Grell relative... in some way it has a similar appearance.