When I started using ODCL I was playing around with color dialogs. I was trying to create a flexible color dialog where the color swatches are configurable and ACI and true colors can be mixed in the same dialog. I have named the result 'FlexColorDialog'. The FlexColorDialog can be a replacement for the default AutoCAD/BricsCAD color dialog if, for example, you want to offer a limited choice of colors.
The ODCL dialog uses a single control (a Picture Box). The Lisp code may be of interest for other projects where the clicked coordinates of a Picture Box need to be analysed.
Note: I use BricsCAD 13.
Edit 1:
RGUS has stumbled upon an error. The error may be caused by the fact (?) that the function (dcl_GetOLEColorValue) does not accept an RGB-list in AC 2013. In BricsCAD 13 this is not a problem. I have updated the Lisp file.