This Vintage Garden Marker from etsy seller monkeysalwayslook is a great way to personalize your centerpiece or as wedding favors.  Place these in your floral arrangements, cake top, or the favor bags you give your guest. 

These seed bombs from Anthropologie make great and stylish eco-friendly favors.  It includes a set of five seed bombs (includes seeds and soil) packaged in a muslin bag.  Toss them into your garden - no digging required - and you’ll have a yard full of blooms indigenous to your region.