There's tilesets, but honestly I think they detract. My extended ASCII are like 8x12 pixels and scan really easily. Even at 32x32 I can't reliably tell the difference between a dog a cat or a rat in most tilesets, especially on first glance, so a lot of memorization is still required with tiles, they allow for less information to be displayed at once, and they are more complicated to recognize.

I don't even see the extended ASCII anymore ( http://i.imgur.com/7ci106g.png)