Took the basic icons I'd created yesterday and worked on them till they look better. Built all the bitmaps, then replaced the originals in the dll, and rebuilt the dll.

For future reference, this is the best way to proceed:

• Start with a document 60px by 60px in Inkscape.
• Set grid units to px, and space the lines every 5 px.
• Leave one grid width empty around the drawing.
• Group objects carefully, ending with a final group containing everything.
• Build the bitmaps on OSX (its GIMP is faster and less buggy).
• Test the results of each bitmap build operation. Look out for misplaced text; if there is any, convert the text to paths.