I recently discovered the excellent online photo editor pixlr.com which provides a powerful, responsive photo editor within your web browser.
The interface will be familiar to anyone who has ever used Photoshop - with full support for multiple layers, retro vintage effects and many common photo editing tools, such as the paint brush, pencil, dropper, lasso and magnifying glass.
The retro vintage editor provides three settings (accessible from the dial), each featuring a side scrolling list of effects, ranging from bubbles, fog and glitter to stylized border shapes. There are many combinations you can try to customize your photos.
Images can be created or uploaded from a computer, URL or an online library.