I freaking love silent comics! People often forget comics, just like movies, are visual storytelling. Movies can still work as silent types if there's a right atmosphere established, character expression, and clear direction. The same can be applied to a silent comic. I forgot what it was called, but there was a silent animal almost grungy webcomic I used to read on deviantART. The story was between a tiger and a mouse if I remember correctly. It got a healthy number of comments and feedback, and the artwork was gorgeous. i think it was done traditionally too, lots of watercolor.
If you pursue it, I would love to check it out!