Lutenol
If you want something a little less realistic, there are plenty of fantasy crazy colored contact lenses out there too. With vampire and Gothic themes prevailing in movies, TV, and books, there are an assortment of different crazy color lenses that will give you an Underworld or Twilight look. Have scary vampire eyes - red or white for a more supernatural look - or gold colored eyes for a softer vampire costume. More along the lines of animals, dragon eyes are also available. You will also find other character lenses from various movies.
If you just want to have some fun with your cosmetic contact lenses and you're not going for any particular character, intense colors and patterns are also on the market. Have neon pink or blue eyes for a shock of color that will really illuminate in the dark. Or go for some whimsy with spades or swirls for a lighter, hypnotic effect. Whatever your choice of crazy colored contact lenses, the variety will give you plenty of options if you change your mind.