30 simple rangoli designs on an 11×11 grid of dots, each with step-by-step pictures and a count of how many dots of each colour you need. Every one has four lines of symmetry, so you draw one side and copy it.
Start with a grid of dots in chalk. Fill the centre, then work outward one square ring at a time. Because the pattern repeats on all four sides and along the diagonals, you only ever have to design one eighth of it. That's also why rangoli is a favourite way to teach lines of symmetry in Class 6 and 7.