At work one day my friend said what she'd really like for her birthday is a Blue's Clues ice cream cake.
The birthday girl was 24.
The base of the cake is a boxed brownie mix baked in a round cake pan and four cupcake size cakes. We mounded vanilla ice cream over the cake for the desired effect. We mixed blue food coloring into some of the softened ice cream and put it on as a final layer, then refroze.
A lazy susan makes it much easier. Michael's has Blue's Clues specific food coloring.