I had some birthday stickers that I had never used, so I thought I'd try them. First I took some yellow watercolor and splattered part of the card.
Then I added the stickers, including the "happy birthday" banner, with would act in place of stamped sentiment. Then I threw in some purple gems to balance everything out.
It was pretty easy, but I think I actually like using stamps because you actually put more work into a card.
There's not as much work in just popping some stickers on a card, but that's just what I think! :)