How do I add an initial mosaic to old windows?

Hey Barbara! Here's a great step-by-step tutorial that should get you started: https://www.hometalk.com/diy/decorate/rooms/grout-less-mosaic-inspired-window-29524511

Good luck!!

Very nice , hope your project goes well.

Hello Barbara! Here are some great ideas for the project you are working on! Best wishes to you and Merry Christmas.

https://www.pinterest.com/pin/192388215315213140/?lp=true

I like a good CLEAR fast trying epoxy glue .. like E6000 for glass/glass application ... and it supports heavy weight ...

just draw the pattern you want on the REVERSE side of the glass .... lay the window flat,

(be sure the glazing ( caulk, etc.) that holds the glass in the frame is secure!)

Apply the glue to the 'gem' and place it on the glass.

leave window laying flat for a day/two,

hang -- but it will be much heavier -- be sure it's supported securely!