Exposed-infill IKEA Rallen Qi Pad
If you've got a favorite infill pattern that you love the look of, this design will let you show it off :) Print this design with no top/bottom layers, three perimeters (suggested) and your favorite infill pattern/percentage.
Takes the center piece from a cheap IKEA "Rallen" Qi charger. Throw out the outer plastic ring, and keep the center piece and the grey rubber ring. You'll also want to stick some adhesive rubber feet to the provided corners, I buy mine at the dollar store.
The size of the base is sized for my Galaxy S6. The OpenSCAD source file is attached, and Customizer is enabled, if you want to change the dimensions for a different phone.
Note that the uploaded STL/SCAD files and the pictures are slightly different; I've reduced the gap around the top edge of the charger, and the cable goes into the cable slot a bit easier.