Site offers 8 different categories of image effects, with four dozen different effects. Many are animated. Click to see examples on example collage and find the best effect for your image. There are many different ways you can change your image, here you have a variety of effects, pick the best for you. ImageOrama This site I think is more for web design tools, but I really enjoyed it.
Site includes simple stuff like lines, bullets, buttons, and gets into gifs and other stuff.
Click on one, check it out. There are six different categories and each category is useful in selecting exactly what you need for your design.