Handmade by Julie had challenge #4 - pick a sketch. I love this. I picked 74 as it is as close to my favorite number (747) as I could get) I just didn't feel that a sentiment was needed. And sometimes, maybe they need a more sober looking card.
Often, when I can't figure out what to do with a special paper or embellie - I just pick a sketch and make it work. If you are stuck for card mojo try going to the list at Stars and Stamps there is a weekly sketch challenge, too.