Here's my secret!
I bought plain-Jane, classic white frosting and a box of cheesecake flavored jell-o pudding mix. Take off the top and aluminum from the frosting can (and take out any amount if you wanted to mix different colors, it'll make more room) and microwave for 5-7 secs. You don't want it to melt, just to get warm enough to manipulate. Pour half of the pudding powder in the can and mix well.
I covered the cake with my [now] Cheesecake icing, and used a little of the icing I sat aside to make green grass for the "nest" my Peeps were in!
**This could be a cute Easter cake too**
It was delicious and did not last anytime once it was cut into! Experiment with some of your favorite flavors and different colors, and let me know how they turn out, too!