Photo Collages - your thoughts?

Lizard Mosaic

I know there are very few lizards about in the UK at present (though I did read of some on Facebook some days ago), but I thought I would have a play around with my photo programmes, following advice from a Mac forum, to see what I could learn to do.

I don't think I have found the right solution yet, so would be interested to know what mosaic or collage programmes you favour. Options based around Picasa seem popular.

Five of the creatures in my collage are Common Lizards, photographed in the UK with a zoom lens. The remaining three, including the one at the bottom on the right, were seen in the Peloponnese five years ago, and I have not identified them. They may be Peloponnese wall lizards.

Lizards are a protected species here in Britain, along with other reptiles. They are included in the Wildlife and Countryside Act of 1981.