If you wanted to reconsider Tk, maybe the Tk::Canvas would do the trick for you. You can easily setup an invisible grid on the canvas, then put whatever you want at each point, anchoring it to "north' or 'center', or whatever. You can mix Text and small graphics, and even draw outlines around them for emphasis. GD will do that, but it's alot trickier with GD, getting colors and fonts just right.

Then you can take a png snaphot of the Canvas with Tk::WinPhoto, or export it to postscript.

I think you will find Tk has more flexibility than GD, but it really depends on what your needs are.

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