This midweek throwdown is right up my alley. It's rare for me to create a card that doesn't include at least some printed paper and I often use more then one. Mixing papers can be a little tricky and my approach is to just makes sure that one of the papers is much more dominant then the other. If you're new to card making or don't feel completely comfortable using printed papers I suggest starting out by combining them with solids (embossed Cuttlebug solids are great with prints) and then move on to replace the solids with tone-on-tone and subtly printed designs.
Though I have lots of rubber stamps that I enjoy using at heart I am really, truly a "paper person" and could be just as happy creating cards with nothing but pretty papers.
Happy Crafting Everyone!