Write, draw and generally be creative. Be creative and courageous. Do experiment. Do not be afraid to use bold colors. Mix together black with red, magenta, strong green, an intense blue, neon colors, use coloring the edges in the firmly contrast colors. The painful truth is: if your card is average or similar to the rest - it will 100 percent land into the trash. Sad but true. Stronger and even more accurate version is: stand out or die (of course on the market).