This one has great color and a sweet sentiment, right? I use Picmonkey to make teasers, but I have friends who use PhotoShop or even Microsoft Word. The key is to pick an appealing graphic and a phrase that catches readers' attention. And don't forget the ordering or author info!
Here are a couple I've made recently. What do you think? If you're a writer, do you make teasers? Do you think they help your sales? And if you're a reader, do they tempt you to buy?