Blocco - Blocco is a customizable geometric pattern kit
AndreaMosaic - With AndreaMosaic you can create your own photographic mosaics made with your own pictures.
PatternPad - Create beautiful geometric patterns
WidsMob Montage - Make stunning mosaic photos or montage shape with tiles, which supports both JPEG and PNG files.
GeoKone - A web application for drawing awesome geometric shapes
Mosaic Creator - Mosaic Creator is professional mosaic tool. You can create your own picture mosaic.