Raster format is also known as bitmap or BMP. They mean the same thing and are comprised of pixels, so when you enlarge them they become diluted. It's the most widely used clipart format and is usually all you need.
Adding elements to clipart can also produce pleasing results. Let's say you have an image of a house that you think is boring. By adding a sunburst behind the house, you can produce a unique new look. The possibilities are endless. Just be aware that clipart can be as plain or exciting as you choose.
Scrapbook enthusiasts love to journal in their creations. There are tons of cool and interesting fonts available online that make the art of scrapbook journaling even more fun. These wonderful, unique fonts are very often designed by other scrapbookers and come in an array of colors, styles and sizes. Implementing different fonts can bring out the creativity in anyone.