There is a group I follow on Flickr called MACRO MONDAYS. It is a moderated and theme-based challenge group, with a different theme each week.
Although I am not a member, I enjoy seeing what those who are post each week. Every so often, I will look around where I’m sitting and see what I can come up with that fits the theme and shoot an image (usually with my iPhone, because it’s handy).
Here is my interpretation of Vibrant Minimalism: