Pretty, looping lines raidation out of the central circle on this rangoli tracing page. Younger children can trace within the lines; older kids might light to try tracing directly on them, then colouring in their creation.
Rangoli Tracing Page 8
This pretty rangoli tracing page has a real "Indian" feel about it, with the star and tear-drop shapes in the centre. Trace over all the dotted lines and then perhaps try colouring it in?
With a circle in the middle and squares at the corners and lots of other lines and shapes in between, this is quite a challenging tracing page for Diwali!