Added.

Mate/restoreThumbnailBorder.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env sh
+
+# Check if I'm root
+if [ $(id -u) -ne 0 ]; then
+	echo "This script should be run as root."
+	exit 1
+fi
+
+# Define our target
+target=/usr/share/pixmaps/caja/thumbnail_frame.png
+
+# Create a temporary file to work with
+oldFrame=$(mktemp)
+
+# Download the old frame from GitHub
+wget --output-document "$oldFrame" "https://raw.github.com/mate-desktop/mate-file-manager/0e004c696b0e68b2cff37a4c3315b022a35eaf43/icons/thumbnail_frame.png"
+
+# Copy the image
+cp -fv "$oldFrame" "$target"
+
+# Make sure the rights are correct
+chown root:root "$target"
+chmod 644 "$target"
+
+echo "Don't forget to restart Caja!"
+