Some excellent resources from TROL at Exeter University which can be printed for use in the classroom:
Wide selection of grids and papers
Geometric Patterns based on a 6-point circle
Geometric Patterns based on an 8-point circle
Geometric Patterns based on a 12-point circle
Grids for islamic designs - try to recreate these using 1cm squared paper as a guide.
Please contact me if you have additional resources which could be included on this page and be freely used by teachers in the classroom.