Here's a beautiful image of a clover image designed with celtic knots.
Since not all clover are lucky, here's a nice clipart of a common clover with 3 leaves.
And of course since this page of images is for St. Patricks and all things Irish, here's a very nice image of a four leaf clover.
Shimmering green shamrocks in the shape of a wreath, lightly animated.
Animated shamrock wand.
Another very Irish image that's perfect for St. Patrick's Day celebrations.
A group of happy smiling Irish shamrocks
A lucky charm almost everyone will recognize, the four leaf clover.
This image is a bit large, but it's my favorite on this page, the pastel greens and smooth outline just look so crisp!
Animated four leaf clover spinning around.
Animation of a 4 leaf clover with a smiling face.