Have something to celebrate and need a free image with fireworks? Check this one took by talented photographer Alex Holyoake and shared from his courtesy under CC0 license. Download from here with the right (save image as...) at the optimal resolution for your phone, tablet, desktop background or resize it yourself for your blog article, app, web design project...
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x2048 (compatible with many tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many phones)