You have to make a necklace, an anklet or a bracelet, and for that you have got a broad picture in mind about how it would look and what colours you would want to use. You may have also got different kinds of beads to make it look pretty and pendants to make it look attractive. But you have no clue about how to do the remaining part - the empty spaces. A great idea would be to fill the rest of the spaces with seed beads.
Seed beads are tiny beads that are measured by a /0 numbering system. Higher the number, smaller the beads. Basically, the number indicates the approximate number of beads in every inch, when the beads are arranged in a linear manner on the ground. For instance, if you can lay 6 beads in a straight row within an inch's space, the beads would be numbered as 6/0.
The most famous of all types and kinds of seed beads are Czech and Japanese beads. While the Czech beads are famous for the uniformity in their sizes and shapes, the Japanese beads are known for the high precision in quality of the beads and beautiful and unique designs they are available in. Czech seed beads are shipped on hanks. (Hanks refer to a strung bunch of beads, where a standard hank contains 10 to 12 strings that are 20' long.)
Apart from jewellery, seed beads are also useful in art and craft projects, in decorating upholstery and tapestry, and in beautifying accessories to give them a funky fashionable look. If you are looking for good quality with nice designs and different colours, a good place to look for them is the Internet. There are many good websites that provide all the jewellery making materials, where you would get seed beads of your choice.