If you are like many others, you will find wintersowing addictive. You can wintersow most perennials that are hardy in your zone. Many annuals will also wintersow well.
I wintersow in pots (among other things) and I put the pots in clear rubbermaid/stearlite tubs in which I have made several holes in the tops and bottoms.
You will find that you have great germination since you dont' have to worry about providing appropriate light, temperature variations, dampening off, washing away, or snacking critters. As things warm up, just make sure that you keep the pots moist.