This first piece is an original design by me :) but done with colors going from warm to cool across the work. This was done with acrylic and was difficult because it is rather small (5x5) and my hand was definitely not steady enough.
The second piece was also done with acrylic and is 5x5. This was done with a ray of colors from one section of the color wheels. Being able to add white and black to the colors allowed me to get a range of variation within my piece.