Happy Days Digital stamp set from RGStudio360.
Resize the digital stamp to fit on your card (one sheet will make 4 fronts)... personalize with the desired sentiment, print and cut.
Just a little bit of coloring and VOILA you're ready to add to the card base. The stamp set didn't offer the sentiment I needed, so I created my own using PrintShop and printed using a couple of fonts. It's easy to create a whole stack of fronts in an evening... and the coloring is so relaxing!