I'm looking for some designs like you would put on bookmarks, something narrow in width and not too tall in length.... I am going to put them on eyeglass cases.... does anyone know where I can find such designs.... It will be greatly appreciated...

Down the bottom of the page, are a number of cross stitch bookmarks that might do the trick.

Joy has bookmarks with design already on them.
Liane stitch has great floral bookmarks. I see bevintex has already given you that link. Direct links to the bookmarks don't work. Go to Free Designs on the left.You will see Organza down on the right. Browse all of the categories, there are a lot you can use as bookmarks.

look in free designs at lianestitch,the book marks are labeled lesezeichen, scroll down for some pretty flowers
Also look in kreative pe designer tab for lesezeichen,it has more tall designs. Get the kitty bookmark too, it is a must have