Excellent plugin!
Try a PNG brush with an alpha channel for the best results!
A few minor requests and quibbles:
Loading a brush duplicates the existing brushes in the column on the left.
Spacing doesn't seem to do anything - would be nice to have more range (ie 1,2,5,10,20,50,100,200,500,1000,2000,5000)
(If this is intended to skip image placements when drawing a line)
Scatter would be nice - user could specify the diameter of the random spray
Aside from the above, this plugin is the most important add on for Paint.NET.
Very well done!
Cheers!
Don White
(The attached file was made with a rainbow teardrop with the background cut out. This was drawn onto a black background)