There's a multitude of St Patrick's Day inspired challenges around at the moment - I've made a very quick card based on three of them:
This is my version of a 4 leaf clover using a couple of small leaf images from Waltzingmouse. I've stamped them and smothered them in Wink of Stella, then stamped the WMS sentiment over the top. I've used four different shades of green ink so I'm entering Less is More's monochrome challenge. The Card Concept also has a monochromatic theme using green and Addicted to CAS' inspiration is 'luck or lucky'. I don't think you could define this as anything but clean and simple in style!