I downloaded icons from https://android272.deviantart.com/art/Flat-GIMP-icon-Theme-V-2-1-375010811
No idea what the name of the original author was.

cp stock-tool-free-select-22.png ../lasso.png
cp stock-tool-move-22.png ../move.png
cp stock-tool-rect-select-22.png ../select.png

—— original license from the zipfile below ——

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