Don't get too excited. For the simple CE scripts, you still need to tell the enemy how to move around. So there's still a little scripting going on. But the graphics and size are entirely dependent on what FFCs you assign, as the script headers explain. All you have to do is assign the scripts with the right Data fields, set up your FFCs, and change the script dealing with the enemy movement only, and you're done. Right now, the following enemies have simple CE scripts:

bouncer_CE = The blue flea things from Zelda 2, appear in Scorpio.
diamond_CE = The crystals that bounce off of the walls in Gemini and Libra.
crawlie_CE = Crawls along the ground towards the player, hops up small ledges, fires Swords.

And a bunch more I'm not remembering now. I'll go post the code tonight.