These Flower Pot cards were on all the blogs early this year (so I'm lagging a bit behind!), but I thought I'd give them a go. I used the Stampin Up Vintage Vogue set (which I think is a little 'busy', and the Stampin Up Flower Fancy stamp set (which turned out lovely). I've also seen this done brilliantly with the SU Petal Pizzaz.
One thing I didn't like about the flower pot cards is that you couldn't stand them upright. So to fix this I attached a little easel on the back which folds down flat to fit in an envelope (see piccy below). Problem solved!