Take 4 canvases of each size), paint them a solid base color and add vinyl or stenciled design. stick decals onto canvases, paint the whole thing and then remove the stickers to reveal the wonderful artwork!
Good tutorials on creating wonderful texture and color. Yours Artfully: Liquid Leaf Luciousness In More Detail. Not sure why anyone would put this much work into a gift tag, but it would be the start to great art work.
This was made with a splatter effect using spray paint. Bold and vibrant color combos to make a very visually striking. We can't use spray paint in school but we could splatter an the kids would love it.