Take 3oz of dark rum, 3oz of white rum and 2oz of blue curaçao.
Although, this is food coloring and not blue curacao.
A house favorite is the surf sider ("pineapple juice, rum, blue curacao plus love!")
Substantial consumption of products containing blue food dye, such as blue curaçao or grape soda, can have the same effect.
The only constant, in fact, is the name and the blue Curaçao.
(A blue whale, which contains one and one-half ounces of blue curacao.)
There are also drinks that combine it with tonic water, other soft drinks such as coca cola, or blue curacao.
For eye appeal, order the Sapphire Martini, a gin martini with a splash of blue curacao.