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This DIY custom postcard is a piece of cake

#1/13: Cake postcard
#1/13: Cake postcard
Make a mailable slice of cake! This 3-D cake postcard is 100 percent mailable. The postage is around $3 per slice, but the reaction from the recipient is priceless.
#3/13: Cut the sponge
#3/13: Cut the sponge
With a serrated knife and using a sawing motion, cut a sponge into two cake wedge shapes to make the postcard. Large sponges can be found at hardware stores and in the automotive departments of most big discount stores.
#4/13: Cut a groove
#4/13: Cut a groove
Using an X-Acto or utility knife, cut a section of foam from the center of the sponge. It's doesn't have to be perfect. Just cut a wedge big enough so you can add a line of caulking there later.
#5/13: Paint the sponge
#5/13: Paint the sponge
Paint the sponge wedges with the desired color. (Brown looks the most realistic, but pink and yellow are fun too. White was probably my least favorite.)
#6/13: Trace the shape
#6/13: Trace the shape
When the sponge wedges are dry, trace around them on a piece of cardboard, craft paper or colorful scrapbook paper. This will be the postcard side. Heavier paper works better and will give you a sturdier wedge of cake for mailing. Cut the postcard shapes from the paper.
#7/13: Apply the adhesive
#7/13: Apply the adhesive
Spray glue the postcards to the solid, flat sides of the sponge cake wedges.
#8/13: Prepare the 'frosting'
#8/13: Prepare the 'frosting'
Using a caulking gun and your desired caulk, fill a plastic disposable piping bag with half of the caulk. This should be enough to do one cake wedge. I was able to pipe two cake postcards with one tube of caulk, but I recommend putting only half of the caulk in the bag at a time. Also, I tried decorating my cake wedges using the caulking gun but it was nearly impossible to control.
#9/13: Frost the center groove
#9/13: Frost the center groove
Pipe a line of caulk down the center of the cake wedge where you removed the sponge with your X-Acto or utility knife.
#10/13: Frost the cake
#10/13: Frost the cake
Pipe dollops and swirls of caulking on the top and sides of the sponge wedge just like you're decorating a cake. Pipe along the edge of the cake postcard to form a seal between it and the sponge. If needed, use a small paintbrush or toothpick to swirl and adjust the thickness of the caulk on the cake top and side.
#11/13: Allow it to dry
#11/13: Allow it to dry
Allow your cake postcards to dry for 3 to 5 days. I placed mine on sheet of parchment paper and lifted them up periodically so the caulk wouldn't dry and adhere to the paper.
#12/13: Write a message
#12/13: Write a message
Write your message on the postcard side, leaving enough room for an address and postage. Sizes, shapes and the weight of each cake postcard will vary, but most of mine required three $1 stamps.
#13/13: Get creative
#13/13: Get creative
Change it up by experimenting with different colors for your cake and frosting.
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