THE PERFECT CIRCLE:

Rule:
Draw a perfect circle which is larger then the previous one. Each person took 60 seconds to draw their circle until it filled up the page.The different colours reflected the time and application of line to draw the 'perfect' circle.This creates some sort of design in the end.
HATCHING:

Every player had a different colour pen: red, blue, green and black. Each player placed a dot on the sheet at an angle position but not further than 10 cm from each other. The lines had to connect two dots. This created a visually dynamic piece. There is no winner.
Cellular Relationships

Rules-
Draw a cell that intersects one or two cells of another color.
The center point of the cell must be outside the intersected cells.
Find the points where your circle intersects with other cells and connect them with straight lines.
Erase all enclosed cell segments that result from the intersection.
If your cell intersects two cells, draw a baby cell within one of them. Cells can only be impregnated once.
Repeat.