Prepare the Table
You don't necessarily have to create a table from scratch to have a mosaic tile table--you can make use of an existing table for your project. However, care must be given to the table before the mosaic tiles can be laid. If you choose to use a wood table, you must treat the surface with a water-resistant sealer that will keep the wood from drying out or warping over time. A marine sealant or finish--up to three coats--works wonders.
A Wood Edge
One lovely way to edge a mosaic tile table is to edge it with wood. In this way, it would resemble a picture frame. Care must be taken to seal this wood as well. You might also want to varnish the wood so it either blends in with the rest of the table or contrasts with it, making a statement. In any case, you want to make this edging slightly higher than the adhesive and the mosaic tile.
A Metal Edge
Another excellent and potentially striking way to edge a mosaic tile table is to use metal such as copper. The metal does not need to be treated. Just as with the wood, this edging needs to be a touch higher than the height of the adhesive and mosaic tile combined. To make sure that the metal edge is securely attached, fasten it to the tables with nails spaced an inch apart. This keeps the adhesive in place on the top of the table and not oozing down the side.