Choose your background colour and pen colour, then click Go. You will then be asked for the number of times the pattern will repeat. Just hold down the mouse button to draw, release to move without drawing. Press C to clear while keeping your selections for colours and number of repetitions. Press P to choose another pen colour while keeping what you've drawn so far. (Thanks to Paddle2See for the suggestion.)
Remixing to be able to change the number of times the pattern repeats while maintaining an existing drawing. Changes in process. Type N to enter a different number. Thanks to deck26 for this excellent drawing tool. Elegant programming.
