Stationary Sets (Arbormann: Research)

Finally completed the business cards. Now its time to complete the stationary set. I decided to take a look into several designs which use layout and the colour pallet to their full potential.
I want to bring the portrait format from the business card into the rest of the stationary set to make them work as a series. I have already experimented with the layout - and so far im struggling so i really do need some inspiration.
Im taking note from these designs how they use the layouts and position the logos and contact details.
However i think more research is needed for inspiration.