Can you give me ideas on how I can make a DIY version of this (pic)?

It's very beautiful. I would use it as a guide. It looks like they have gone up the straight side and ended with a wave pattern. You can find wave patterns on Google, print one up, cut it out and trace it on the glass (they sell glass pen markers that erase with a cloth). Or you could try to draw a design free hand with the marker, since it will erase, you can try until you get a design you like. Then just fill the pattern in with sand, shells, glass making sure to use a glue that will adhere to glass. I think you could make a really unique piece!

Use this as your guide and do a dry fit. Then when happy with your design, snap a photo with your phone or tablet so you know how to glue your items in place. Using a stencil or even a free coloring book page that you can download and print is a great idea too. If using a coloring book page, place underneath the glass as a guide and glue your design on top. I do this all the time, I see something I adore, but can't afford, take a photo and recreate for a fraction of the cost.

You can save the picture and use it as a guide. You can also look for patterns/pictures online

https://www.hometalk.com/diy/decorate/rooms/updating-an-old-picture-frame-30435259

https://www.hometalk.com/diy/decorate/walls/diy-sea-glass-window-art-37257013

https://www.hometalk.com/diy/decorate/rooms/a-garden-window-to-another-world-28498333

This is beautiful, no wonder you wish to replicate for yourself. I would definitely print off a template and use it as a guide.

I made something like this out of an old window my sister had. I used clear silicone (clear caulk) to glue everything down. Because it was my first time, I had to use q-tips to clean the edges where too much silicone oozed out. Its water cleanup, so don't be scared to use it.

Once you design your pattern, lay down about 4 inches at a time of silicone on your glass/window. Just eyeball it and coat as much as you think you can do in 10 minutes. Use a plastic paint scraper to flatten the bead(s) of silicone. Just don't flatten it more than approx 1/8" thick. Silicone takes a while to dry dependent upon how thick it is. If its drying too fast, you can coat it with water. Now just start your pattern. You decide where you want to start/stop. Once its dry, you can peel it off and cut through the silicone if you don't like the pattern and start over.

Hope this makes sense and helps...

Thanks! This is very helpful.....a lot of really good suggestions

Yes! Please use silicone. Hot glue would never hold up.

I'm anout to try the same type of craft but I was going to use E6000 for placement of my items and then do a resin pour over top as the example shows. I'm wondering now if the silicone is a better product for this? As to why its so costly I guess time and expensive products used.

I really don't know about pouring resin over it. I don't like E6000 for the simple reason that every tube of it (3) I've bought had partially dried out. Too expensive for me.

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I would for sure use resin with that