Matrix Setup
WLED has a handy 2d-matrix setup feature that will take care of the mapping for you on a rectangular matrix. Go back to Config and choose the 2D Configuration tab.
Change the dropdown to read 2d Matrix, and additional options will appear. If you want to sync more than one panel, you can do it here.
Set up your layout numbers to match the number of rows and columns in your project. You can also change orientation here - my pixels start in the lower left corner and finish in the upper right.
Matrix Effects
WLED has a hefty number of matrix effects that appear in the list when you've got your 2d matrix set up. Click the little square in the "filters" popup to see only the 2d matrix effects. Many of them can be customized with speed and intensity sliders, or different color palettes. Go wild!
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