Make a sheet cake the size that you will need. Using white buttercream icing, ice the top of the cake using a cake spatula making sure it is nice and smooth.
Now make a red colored icing and a blue colored icing. Fill three bags with icing using star tip, size #18 on each. One bag will be filled with white icing, one with red icing and one with blue icing.
Start with one corner of the side of the cake and make three horizontal rows of red icing.Next to that make three horizontal rows of white icing and then three horizontal rows of blue icing.
Continue in this pattern until all the sides of the cake are done. This is shown in the first 4th of July cake picture.
With white icing and round tip, size #5, draw the four in the middle of the cake being sure to divide the stripes and solid bottom part of the four. Refer to the picture.
Make the three red stripes of the four using the same red icing and star tip, size #18. Now fill in the white stripe of the four using the same white icing and star tip, size #18.
Next fill in the bottom part of the four using the same blue icing and star tip, size #18.
