I've already slightly adopted the colorscheme of my Frankfurt themed beamer class with:
% Define my settings
\definecolor{mygreen}{cmyk}{0.82,0.11,1,0.25}
\setbeamertemplate{blocks}[rounded][shadow=false]
\addtobeamertemplate{block begin}{\pgfsetfillopacity{0.8}}{\pgfsetfillopacity{1}}
\setbeamercolor{structure}{fg=mygreen}
Due to the settings of the structure-color to "mygreen" also the color for the block is set to green similar to the exampleblock. Thus I want to change the color of the exampleblock to blue (like the default non_modified block in Frankfurt) or yellow (like in color scheme crane
I tried: \setbeamercolor{exampleblock}{fg=blue}
which has no effect :(
Any suggestions?