So, there are a bunch of wordless Graphic Novels out now with Shaun Tan's timeless tale, The Arrival leading the way. Here are a couple of others:
Robot Dreams by Sara Varon
There is not a lot I can say about the plot because I do not want to ruin it, but this is an incredible book. Varon writes about a dog who has a robot, but doesn't realize what could happen when he takes his robot to the beach. Things then change drastically for the two in this touching GN. The art is simple and I can't say enough about this wonderful book.
A.L.I.E.E.E.N by L. Trondheim
This is for those of us who still laugh at poopy jokes and the like. Trondheim has found what alien kids read and put this out for us to read. Actually, it isn't really wordless, but I don't know their alilen language so it is basically wordless. Aparrently, alien children really dig cutsey drawings who do disguting things and wade in disgusting things, which doesn't make for that great of a GN, but it is funny.