PlotMarkers 2.00 adds shape markers, which draws a box around each claimed plot or group of plots. The color of the box can be specified in the config file. If you're upgrading PlotMarkers, it's probably easiest to rename your config file and allow the plugin to create a new version with the new fields. You can then reconfigure as necessary.

The POI markers and the shape markers can be shown or hidden in BlueMap's menu in the web browser.
This release also fixes several errors:

• Markers were not updated properly when deleting a merged plot.
• An incorrect test for an empty string caused problems with custom markers. (Thank you to alekso56 for fixing this.)
• If the map definitions did not match the world names, markers wouldn't be created. It will now also properly handle cases with multiple maps for a world.
• This version also opts-out of Paper's plugin remapping.