Twinge said:
I haven't personally used GIMP much, but I was under the impression it was primarily (if not entirely) for raster graphics, and NOT for vector.
I think there are some free sources to produce vector images, however - try searching the forums for such.
www.inkscape.org was one, though I haven't personally used that one either.
Bingo! Thanks everyone so much for the help.
I really didn't understand the difference between bitmap and vector until now. Quite simply, in a vector image editor, the image should never break down into pixels when zoomed to the maximum level. This is probably common knowledge for y'all, but for me it was a revelation. Hallelujah.
As I've said before, in the past I've always submitted graphics for printing using india ink, tracing paper and rubylith.
Years ago I had used Corel Draw for a bit, without really understanding what I was doing, but never for submission to a printer.
I've reworked my design yet again using inkscape, and resubmitted to Spreadshirt. Based on what I've read in the forum there, it should be accepted.
Best of all, Inkscape
http://www.inkscape.org is Free/Open Source Software and runs on Linux - things that are dear to my heart.
On top of that, with this new tool (it looks just like Corel Draw used to) and my new understanding, I should be able to create some pretty nifty graphics.
MjM