A very simple sketch... the patterned strip is home printed, from a digital paper pack I bought online.
The card is 6"x3". I often use this size because I can obtain four card blanks cutting a standard sized scrapbooking cardstock. And it's a nice size to use those itty bitty stamps that seem too small on a stardard card blank.
Since I didn't find the envelopes, I made a template, that you can find on my blog.