Look at this site full of patterns:
http://www.crochetpatterncentral.com/directory/flowers.php
Hope this helps.

Simply google "crochet flowers patterns" and you'll get a whole pile of links.

-Babka

Here is a link that might be useful: Crocheted Flowers

Attic 24 is a favourite blog of mine and there are a couple of free flower patterns there. Check the side bar for the links. Here is a direct link to one of the flowers.

Here is a link that might be useful: Attic 24 flowers