I needed a calendar "icon" style image, so quickly created this in the "flat icon" style. Much use of the "move" function, recalled by Cntrl D each time needed to repeat the move. Eg the "dates" was a rectangle repeated 7 times in total, with the "weekends" coloured differently (here red). That whole row was then moved down for the next "week", then that repeated Cntrl D. I lasoed a few days off the end of the last row as calendars tends to look so. The spring and hole was created with ellipse and rounded rectangles from the greys swatches, and the multiselected group of objects moved and Cntrl D'd.
The "shadow" was a Blend using repeated iterations of the grey background rectangle, then expanded, opactity set lower and the blend mode set to colour to let the background shine through more.