GIMPshop is a modification of the free/open source GNU Image Manipulation Program (GIMP), intended to replicate the feel of Adobe Photoshop. Its primary purpose is to make users of Photoshop feel comfortable using GIMP.
Now you can create your own sign generator! Just find (take your own with a digital camera, maybe a DVD still image grab, search graphics sites, take a pic from TV, etc) an image of a sign or a photo where there is a clearable area to place text. Use GIMP (best freeware photo editor) to clear out the text area (if there is text already in the way) and then import it to this site to manipulate the text with hundreds of fonts, also make sure the image size does not exceed 650 pixels (height or width). You can even use a photograph of yourself (use free hosting so you have a web URL to use) or loved ones and add comic book styled bubbles (sample) where you can change the text characters to suit your needs (captionize your photographs), you can literally turn any image or clipart into a sign generator!