If you want to be original you need some really crazy stuff to work with. Like these vector graphics here. Not only they look great bu they also attact a lot of attention because of their bright colors.
Cloud speech bubble vectors
4 EPS cloud bubbles with jpg preview – 19.6 Mb – Speech bubble vectors
These cool vectors are very good for business cards, to create Photoshop layered design with actions, for brushes and patterns, brochures and flyers, fashion design, logos and icons, web-design, or labels and stickers and so on.
License: You can use Cloud speech bubble vectors for personal or educational purposes.