Tie Dye Frosting

This is a super fast post.  It's my birthday.  So I made my chocolate cake and used my favortie frosting.....a store bought Butter Cream.  I took the butter cream and divided it into approximate 5ths.  I left one white and with my NEON food coloring I made a green, blue, pink and purple.  I slopped the frosting all over the cake like this:

Then I took an offset spatula and spread it all around

 and this is what I got:

The more you spread the more the colors blend so it is important to not over spread the cake so you can see all the variation in color.  It is not perfect, it is a little sloppy -

 but for my birthday it is just what I wanted.