I mentioned that my favorite glass tile pendant is the photo one of my kids.
First a quick shout-out to Photoshop Elements - I recently bought version 7 on Ebay for $30 - that's a minimal price to pay for great editing software. I love "actions" which are things you can download to automatically give your pictures a certain look (let me know and I can do a post on what they are more specifically) and I don't feel at all that I need the full-version grown-up Photoshop - Elements is meeting all my needs and I'm sure it can do lots more that I don't even know about.
So open up Elements and the picture you want to use. Tweak your colors to how you want them. Then crop your picture to a square - to do this click the crop tool and then there will be a drop-down box where you can choose 5x5 - that's a square (equal sides, equal angles - you know). Then drag the box over your picture to how you want it.
After you have you have a square picture click on "Image" and you'll get a drop-down box where you can click "Resize" and you'll get another drop-down box to click "Image Size"
Where it says "Document Size" change width and height to 1 and make sure it says "inches" (if not there's a drop-down menu where you can choose inches).
Voila, a 1x1inch image. I opened a Word Document and copy and pasted a bunch of 1 inch pictures all on to one sheet and just printed them off on regular paper. It worked great.