I've never even been to your site before, and, frankly, didn;t even know it existed.. I get my artwork from other sources, or make my own.
Besides, I don;t sell the artwork - I sell the service of putting cases together. I am a transparent business - I have links to my sources on the site, and encourage people to make their own cases. What I do charge for the folks that decide not to make their own cases covers ink, paper, the cases themselves, and a very small fee for the modification process. I'm not trying to profit from or take credit for the work of others. I'm profiting from the work I put into assembling cases, and that is all I take credit for (if I haven't created the cover myself).
That said, I won't be using your artwork. In fact, if people want blank modded cases, I can do that. Then they can put whatever artwork they want in there.
Thanks for assuming that my intentions are genuine.
ADDITIONAL (Edit): The OP clearly stated that he planned to print his own covers AT HOME for HIS USE. Frankly, there's also a link to the same cases that I use and mod right here in the thread - all the components are here, save one.
Here is where you can find open source, free for all, covers for Universal Game Cases for Coleco Vision.
I encourage you to make your own cases, but, if you do not want to mess with the mods, let me know.