Dumpr is a website which lets you add funny effects to your photos in one-click, after you upload them online. Its free version offers most of the effects and some effects are reserved for the pro members. You can upload photos from your own hard drive, or paste in URLs from some of the major photo hosting services, including Flickr, MySpace, or Facebook. Dumpr provides the quick link panel beside each picture it renders, which lets you quickly embed your edited photos into Facebook, Blogger, Wordpress, and other social communities.
The operation is extremely fast, and no technical knowledge is needed to receive modified pics with descent quality. It is purely web-based, and no software downloading or installation is needed. No registration required for free effects use.
As illustration of the possible outputs, you can see several examples below:
Access Dumpr website: http://dumpr.net/