I do love mosaic style! I follow cross-stitch patterns. I have the pattern for a jellyfish all set to go in a "kit" with the fabrics, but not ready to tackle for a while.
I have developed a system for making these, which makes it go faster! Odd rows pressed left; Even rows pressed right. Then the alternating columns are pressed up and down. This is probably not a new idea, but it is to me.