I find when I look all of my parts storage systems I get ideas on how something should look, the straight lines, simplistic, and yet complex looking. I like seeing semi-opaque containers with the faint outlines of wires and circuit boards myself, it just looks interesting, and the effects you can do with it with LEDs and other lights is really quite cool.
Does the inspiration and motivation to build new robots ever go away?
That's a very good question. It depends who you ask, some yes, but some it just doesn't seem to end.
I find that I get very distracted and look at other projects and stray away from half built things to move onto things that catch my interest (not very hard as I have a multi-track mind).