I've recently come back to creating cards using a glass painting technique. It's exactly like painting on glass with the exception that you use an acetate sheet instead of a real glassy surface. The use of aperture card is common in this type of cardmaking too.
Here are the two random cards I've finished off recently - a card with three tulips and a paisley motif. I think the tulips are my favourite. I love cards with acetate - it gives you so many possibilities and the transparency and lightness of the card is appealing too, I think. It doesn't take much embellishing as the transparent motif on its own looks decorative. As for the text, you can either write your message right inside or make an insert out of a piece of paper, glue it in and write inside it so that the message is discreet and doesn't show through the painted front. I usually decide on it just before writing a card out.
The other thing I like about this type of acetate cards is that it's a pretty rare technique among the card makers and not many people actually make cards using their glass paints, which is a shame cause I'd love to see some other creations like mine :) If you, my dear reader, are the person who makes such cards, please let me know, I'd love to have a look at your glass painted creations :)