Saying goodbye to colleagues that you've spent years with is an emotional rollercoaster. While it's ok to be sensitive, your invitation design itself should remain clean and elegant. This is due to the inevitable fact that these invitations will end up as nostalgic souvenirs. Take this design's dignified shade of blue. It's easy on the eyes and adds to the memento's value, while its chic geometric motif gives it character without drawing too much attention.