PicArtia lets you create photo mosaics online

I love sites that let me do cool things with photos, I've previously posted about Razz and Comiqs. Now it's time to introduce another cool web application which lets you create a mosaic out of your photos :-)
The way PicArtia works is straight forward enough, just click 'start' and upload whatever photo you want to play with. Then it lets you select a Flickr gallery for what you want your mosaic to be made out of. There's a variety of resolutions you can choose from, the low resolutions are rubbish but the medium resolutions are pretty cool and free (unfortunately you've to pay for high resolutions - doh!). Still it's a fun and simple web app and once they introduce the planned feature which allows you to use your own Flickr gallery it should be really cool.