This design ⇑ is a tessellation of triple-headed arrow (based on R6/R3 grid) which resembles an isometric view of 3D co-ordinate axes. The underlying p31m symmetry is destroyed by the 4-fold colouring. Currently displaying an outlined version in Spoonflower's Matisse contest palette. Other colours, stylings, sizes and orientations are available on request and you can even ask for a custom mixture of designs.