lisa~ i would think that plexiglass has to much flexibility and might cause your grout to crack and glass to fall off. I personally have never tried plexi as a base so I am probably not the best person to answer this question

I'm confused. Are you saying you want to do a stained glass replica of the window, or make an ornament with just a picture of the window?

Yes, Bama, I want to do a stained glass mosaic on something...not sure what yet. Wondering if this is doable.

Hey lisa, I am also looking to do ornaments for christmas. I was thinking of doing styrofoam balls. Did one with scraps and it came out pretty good. Thinking of using the balls and cutting 1/4 of it off the front for a front flat surface to mosaic something on.
Are you asking about drilling holes into the plexiglass? Plexi does bend too easily and everything would pop off. You could use an MDF substrate. I am hot onto styrofoam right now, and there are many various sizes and shapes which can always be widdled into something else. Is this the kind of info. you were looking for? I'm interested in your thoughts since my mind is already on christmas too.

forgot to add the picture...duh!!!

the colors are quite a bit muted by my camera...but you get the gist

Lisa, that's a beautiful window! I have done many crosses on plexiglass and they are still holding up after six or seven years. There are two thicknessess of plexiglass at Home Depot. The 1/4 inch thick kind does not flex. They also have a 1/8 inch one that does flex. All my things were done on the thicker kind. I drilled holes in them for hangers using a regular drill bit. I cut the shapes out with a regular scroll saw. Hope this helps!

Sunshine, What are you covering the styrofoam balls with before you mosaic them?

Silvamae, Yes, thank you so much. I will get the thicker one and try it out at least. Thanks so much for your input!

Sunshine, I was planning a gog effect for this. But the styrofoam balls are a great idea too. I might have to join you in making some!

Brendak-used thinset on the experimental one. You don't have to do that. I understand from others you can glue directly onto the styrofoam and grout with no problem. Not sure I will cover it with thinset again 'cause it's so easy to get the shape out of wack.

Silvamae will you explain your process for the plexi? Maybe due to the smallness of the piece the plexi doesn't bend, so it's doable? Any info would be appreciated.

Lisa-that's really pretty and would look wonderful in a ornament!

Sure. I buy the large sheets of 1/4 inch thick plexiglass from Home Depot, I think it's made by Elf Atochem. Leaving the protective plastic on, I draw my shape with a Sharpie permanent marker. I cut out the shape using a scroll saw. I then peel off the protective plastic. I figure out how I am going to hang it and mark the holes for the hanger with the marker. I place the piece over a sturdy empty box and then drill the holes with an ordinary electric drill. My crosses are meant to be hung on the wall and not in a window. If I just glued and grouted, the back side of the cross didn't look very nice with the ugly grout showing and maybe creeping under the pieces here and there, so before I glued, I lightly sponged some acrylic paint onto the mosaic surface side of the cross, enough to conceal the future grout, but still light and thin enough to allow the glue to adhere to the plexi.

If I were going to do a suncatcher, though, that method wouldn't work. So I can see two ways to do it. Mosaic each side of the ornament, second side in a mirror image of the first side (twice the work, twice the weight), or make sure that you have a thin, unbroken line of glue all the way around the edge of each piece so the grout can't creep under. Also maybe black or dark grey grout would look better than an off-white grout?

Back to the hangers - - I tried several ways to make nice looking hangers and I finally stumbled upon this: We had some nice, good-quality Christmas tree ornament hangers that kind of had a spiral shape on each end and I managed to drill holes and feed these through in such a way that they looked nice on both sides. However for something smaller, like an ornament, you could use a pretty twisted yarn or ribbon.

I am sorry I can't post pictures; they all sold and we didn't take pictures before they left the house.

Please keep us posted; I am very interested in how you decide to do these and how they turn out.