'Stained Glass' IS a coleus hybrid. I'm not at all certain that it would be available as seed, many of the cultivars are not, but must be reproduced solely by cuttings. Plenty of on line catalogs will sell the plants.

Images are variable....but this is a fuchsia and pink coleus.

Here is a link that might be useful:

many color variations under the "stained glass" name.

kinda late in the season for coleus, but I'm sure you could find some for sale.

if you want seeds for next season, I imagine Winter catalogs will have coleus seeds for sale. "Giant Exhibition" coleus seeds are pretty good. don't know if "stained glass" coleus seeds are sold.

Salpiglossis is an annual flower often called "stained glass flower". But since you're talking leaf coloration, I imagine this is not what you have in mind. It is worth checking out though, if you're in the mood.