A money-saving Light
The initial concept is a fade-in screen, when the user reaches their saving goal, the screen will show it fully and clearly. Before that, the screen only shows part of the picture according to the percentage of their saving goal. The picture is a random picture, the user will see the different pics for every single goal.
Refinement:
Then the concept goes to be a Snake game-inspired money-saving Light. The drawings for the light appearance:
https://docs.google.com/document/d/1sCVAPJ3AdxX1d65ZXwtO_X9ga1GvGz3s6DDl7hD1Pe4/edit?usp=sharing