There are patterns specifically designed for mosaics, but you don't need to be limited to just using mosaic patterns. If you find a stained glass pattern, you can easily adapt it for mosaics.
The main difference between a mosaic pattern and a COE96 Dichroic Glass pattern is related to the distance between the pieces of glass and the size of the individual pieces.
Many mosaic pieces are used outside. Due to the range of temperatures that exist outside, mosaics made from large pieces of glass will break over time. To avoid this, make sure the glass is well seated in the cement and that there are no air bubbles under the glass. Another way to avoid breakage is to use small pieces of glass. The larger the piece of glass, the more likely it is to crack in the future.
Another factor you need to consider is the space between the individual pieces of glass. Depending on the pattern you use, the distance between the glass pieces should be no more than 1/4 inch.
By using two different spacings, the overall effect will be a unified piece. Larger spacing will provide definition and smaller spacing will unify the color.
Another option for converting a stained glass pattern to a mosaic pattern is to first resize the pattern to fit the mosaic mold you plan to use. If you're using a clear mold, after wiping the mold with Vaseline, cut a piece of clear contact paper to fit the bottom of the mold and place it on the mold's sticky side. Then place the pattern on the bottom of your mold. Using the glass nippers, make small pieces of glass to fill in the areas within the pattern.
Remember to lay the individual piece upside down, the bottom will be the top when you remove your mosaic piece from the mold. When all the glass is on the contact paper, press down on the glass firmly to achieve good adhesion. Now you are ready to fill the mold with concrete.
If you are not using a clear mold place the clear contact paper sticky side up on top of the pattern. Proceed as if you were using a clear mold until all the glass is placed on the contact paper (upside down). Then carefully place the contact paper with the glass into your mold.