I've used the glass paints to colour in the background (the DD method - Dropping and Dabbing!) and then also used them to add highlights by painting on thicker.
Here's one of the samples I made:
It's great to have another way of adding colour to your project. You can actually 'colour in', as on the leaves here, by dropping on the paint with a cocktail stick and then drawing it out. Come along and see it all in the flesh.
There's going to be 25 demonstrators so there's something for everyone.
Thanks for looking!