Waysider X is a great custom. I agree that is a perfect use for that armor. It almost looks like a robotic lion on his chest.
My guess on the rest for why your stalling is that you don't like to paint.
Seriously they all look great so far. If their design or color palette bore you find some key design element in any of their looks to focus on. If I feel like I'm treading familiar water I'll look at armor, sculpting, or camo scheme or some other facet of the figure to try something new. Hell sometimes creating just a new weapon will enough of a jolt to make me finish the figure.