You've complained about not being able to hide from crowds or be that fly on the wall to spy on your neighbor so Starlight, being the kind, thoughtful pony she is and one to solve all problems with magic, hits you with a magical blast that gives you changeling powers. Only it doesn't quite work all the way. While you can change into any creature you want, you can only change into one inanimate object; the first one you change into.
What inanimate object would you choose?
So if size wasn't an issue I would turn into an electrical socket. Sure I wouldn't work and likely it might feel a weird if someone plugged something into me but I could be anywhere and it not be that weird. If I had to maintain my rough size I'd choose a bookcase for the same reason.
What about you?