1) @inktober: Nothing gets better than the original really. Check out the official Inktober Instagram handle for some cool illustrations by artists from across the globe. You can find a few interesting prompts and get to work yourself too. 

2) @anju_illustrates: Follow artist Anju K, for her quirky takes on prompts like suit, vessel and raven. These illustrations are simple, yet thoughtful and might give you some inspiration to work on your own creations.