I was inspired to make some sort of life/loading bar things, from the new Mortal Kombat game (example) I'm still not too satisfied with the circle, so I might add/edit it later!
Metallic frame Easy Tutorial | GAMEUI- ...
MMO RPG - Full Mafia Game UI by anchor_point_heshan | GraphicRiver
Social and Mobile games on Behance
Star Wars: Tiny Death Star Review and Discussion | Touch Arcade
UI Preview set by Eugene Zolotco, via Behance
Make a game like this. Dragging a box makes another item pop up beside it filling in the gap (so you better connect).