Check what we have found! There is a Morphing Buttons Concept: nice examples to get the inspiration for revealing content by morphing the action element.
If you will check the link we shared above you will find some awesome variants for login/signup, info, overlay, subscribe, share, video player and sidebar settings button.
Also the same site have nice examples of Page Loading Effects. There are next effects could be found: lazy, stretch, circle, spill, frame it, tunnel, vision, windscreen, wiper, jammed, blind, parallelogram, tilted, lateral, swipe, wave, origami, curtain.
Check it out. Even if you’re not UX/UI designer you might find some new ideas here.