The creative spark needed to create a design can be elusive: there’s a myriad of ways that you can start those juices flowing.
In terms of the printed word, Acejet 170s blog showcases wonderful examples of design: crucially covering a long timeline. Have a look at this great and often-updated site. There’s sure to be something to kick off your creative streak.
Looking at what’s produced by modern letterpress, you can use the photo-sharing sites to search for letterpress. The images can often link to form a chain of useful images that might not be immediatley letterpress related. I’d start with the Flickr letterpress tags.
A more systematic approach is outlined by John Smith in his Notes on Design—asking us to look more carefully at what’s around us.
Finally the library at St Brides houses a wonderful collection of information related to the printed word. Plan a visit and make sure to set aside plenty of time!