See Colourful Ink Works

Sharpies, Biros, highlighters, and my trusty fineliners: the art mediums of convenience. They do a lot more than you think, and most of them can be picked up at Tesco. Most of the pens I use to make these are actually cheap knockoffs of the cheap stationary I namedropped earlier.
These works are either sentimental from an emotional time translated into a silly animal... or just a silly animal. Either way, interpret these silly animals however you please, I'm sure there's a deeper meaning somewhere.