Here is a fun project for you! Making your own mosaic blackboard is a lot simpler than you think. Make one for your home or give it away, its a unique project that you're guaranteed to enjoy.
1. Sealing wooden mirror base
This is an indoor project that is not suitable for areas where it will be exposed to moisture or water, as it is not waterproof. As wood is porous the mirror base needs to be sealed before tiling. A mixture of Weldbond adhesive & water can be used as the sealer in a ratio of 1 part Weld bond to 5 parts water, apply two coats allowing each coat to dry thoroughly (30 minutes to 1 hour). Coat the area where you will be tiling by using a paint brush. Note, I didn't seal the area that is going to be painted with blackboard paint.
2. Tiling the Design
The first stage in tiling is to cut the ceramic tiles. You might be tempted to break them with a hammer but in my experience this results in sharp edges and no control over the pieces that you end up with, not to mention lots of wastage. Rather than breaking them with a hammer I cut them into irregular shapes using a pair of tile cutters.
Tile nippers work best on ceramic tiles, porcelain and china.They are not recommended for glass because they tend to crush and splinter the glass tiles.
To cut the tile overlap the edge of the tile by 3 to 4 mm and squeeze down. Don't cover the entire surface of the nipper with the tile, this will help stop the tile from becoming crushed and your hand from tiring. By applying pressure to a small amount of tile at the edge you create a fracture along the surface.
How you position the top edge of the nippers will determine the direction of the cut. Angle the nipper to go in the direction you want the cut. For a straight cut align the top edge of the nippers parallel with the top edge of the tile.
When cutting the tiles try to keep the cuts straight, as angled cuts will result in the tiles not sitting close to each other and larger grout areas. Keep your spacing between the ceramic pieces consistent for a balanced overall design.
I used the straight edges of the tiles on the edges of the design, particularly in the lower section.
You could use an adhesive like Weldbond but with this particular project I preferred to use a cement based adhesive. Using a cement based adhesive allowed me to lay the ceramic pieces in a bed of adhesive, which is handy when the tiles don't cut as accurately as you intend.
3. Grouting the mosaic section
To keep the board board section as clean as possible I covered it in masking tape prior to grouting. I didn't do this but would recommend doing it before tiling as it will keep this section clean for painting once the mosaic is completed.
4. Painting the blackboard section
You can pick up a can of blackboard paint from a hardware store.