MajorGeek says: This is such a very easy to use program. The user-friendly creation process is completed within several steps and results in a quality image that can be quickly saved as JPG or PNG. There is also a very useful option (if you do not have many pictures saved) to use Flickr images, which can be easily obtained via a keyword search - this enables you to easily match the theme of all tile pictures with the main mosaic image. Not unlike the very solid AndreaMosaic, but just less complex - making it faster and much simpler to create the image.
Mosamic is an extremely user-friendly application that lets you easily create beautiful photo mosaics from your own photos.
Some similar services will ask you to send your photos in order to create a mosaic with them. With Mosamic, you keep your photos on your computer.
You do not need to have hundreds of pictures on your computer, Mosamic can also download photos from online webservices.