You can make some fun ePostcards at someecards. There are lots of themed drawings you can choose for your card.
It takes less than a minute to choose a picture and a colour and add your own text. Here are a couple I whipped up.
You can start a free account and save your creations – or you can do as I did and just take a screen shot of your creation (shift/control/command/4 on a Mac) and save it. Click here to make your own someecard.