When Becky Rosenthal was launching her wedding photography business she asked us to both design and letterpress print her identity system. So many wedding invites are letterpressed, why not appeal to brides with the same tactility? Here's a couple design considerations for letterpress:
One of the things we like about letterpress is what happens to the white areas within a design. You can see in the logo below how the interior white spaces have a raised effect because the area around them is being pressed down. Creating those white spaces within a solid area is one of the things we try to include in our design work to show some dimension.
Another thing that works well in letterpress design is the inclusion of pattern. Rather than using large solid areas of color (which definitely are not well suited for letterpress) a flood of pattern adds both color and a texture that can be felt.