Well, I was going to go out today and buy some gesso, but my back has been very painful and I just didn't feel like it. I read somewhere that you could substitute gesso with white acrylic paint. So I took a piece of canvas (bought it a while ago in a pack - quite thin sheets of it) and spread it with white acrylic and while it was still wet I stamped into it with this Dawn Bibby design stamp (didn't use any ink, just the stamp). When it was dry, I chalked over the design and then used it to cover a piece of chipboard which has then been matted on to the card.
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As this is a violet colour, I'm linking this as a second card for the ABC challenge V is for violet.